again everybody hear me because I'm I'mwired and I have kind of a very smallrange see if I get carried away you losethe sound thing you know what happens soI have to apologize for my Dutch accentI can also do this in Dutch with anEnglish accent and today I'm talkingabout reaction networks and the RexLanguage Association the red languageassociation is in existence since 1990and we have done 28 yearly symposia nowand unfortunately the number of personsattending is dwindling because it's justlikea lot of all the technology it isquietly using it is losing its user basewe all get older and but for the thepeople who know it it's always a verynice language to programming and theresult is that I'm always preaching tothe choir if I'm speaking about Rexbecause either you heard about it andthen you're in the Rex presentation oryou didn't hear about it and then you'redoing something else elsewhere likeSwift and objective-c and otherprogramming languages so the officialprogram is to tell you bit about whatRex is what its history is what Rex aleg does and how we turned it into opensource for a very large part theunofficial part is of course theopportunity to interact with you and youasking me questions which would be muchmore interesting I think I'm one of thepersons who was an official of schoolsystems programmer it wasn't my jobtitle at the central bank I was enviousand always to systems programmer thiswas during well that I think the verystart of it I mean it was the firsttext-based version that needed tocompete to desk view this was beforegraphics was built ingrexit wasn't like rather active in thefirst version of ours - it wasn't itwasn't and there's an interestinganecdote going with that there was ameeting somewhere in the United Statesthe Rex book by Michael Shaw lay on thetableMike was present and Bill Gates himselfsaid this is what not going to go intoalways - and this is the reason that itwasn't actually in the first standardedition because in the Microsoft daysthere was a standard and an extendededition Rex was him always - EE 1.1 Imean the first version we could justskip because it was a graphical programstarter which did start program verywell by the way could sprint to one typeof printer which was an IBM printer andin those daysdrivers were always one of the lessrealized parts of house - and I'm happyto see that companies nowadays arefilling in that void after the fact soit was inone dogthree where the split between standardedition and extended edition went awaythat IBM IBM did the rewriting assemblerfor most of us - which was an enormouslyexpensive thing that they plannedbecause the first version wasn't seen infront very 11.3 was assembler written byolder IBM people some of them actuallylearned PC December to do this and in myopinion that was the first version thatreally ran well and it it ran so wellthat you could run it into well I thinkit was in the makeup megabytes here arestill even 16 megabytes and and if youfully tricked it out with let's saycommunications manager to go to themainframe and let's say database managerit would run very well in 64 max andthen of course Windows NT came along andstopped nearly every machine in itstracks I was part of joint effortbetween the central bank and a companycalledin to pay it's called equals now it's aclearinghouseand we had to build the new generationof financial workstation and that wouldbe running over stewso of course we had the usual problemsin deciding which GUI to choose at theat the very end I mean we spent the timethat deliberating this and in that timewe could have written all major GUI ofcourse we could have written thepresentation manager a Windows versionand X Windows version it was decided wewould use zinc as a cross-platform GUIlibrary and zinc had its own set ofproblems one of them being that thevendors of things didn't reallyunderstand anything about the allowinitialization so we had terribleproblems with that that's the problemswe requested the source we could get itthen we fix the problem and then thinkrequests that are fixed and theycouldn't get it either so this was itwas an interesting time and our stillwasn't always as rock-solid as it is nowand I remember that during the last partof the project we had the daily buildsthose were nightly buildswe had them beeped over from America andwe had hired one of the security guys toinstall it in the morning before we camein so we would run on the new version ofour stool which had less bugs than theolder version that was only one heldunfortunately the project was canceledat the last moment because like most ofthose projects in those days thehardware was ordered at the start of theproject and I think it was it was a ps2model 70 don't know if anyone remembersuswith not enough memory in it for thefinal system so there was a panic ofcourse and I remember I remember vividlyspending a whole week to page tune allthe executables because there was autility and I forgot his nameI did however find a suitcase I had inthose days in the storage and I alsobrought some of the relics of that timewhich is the oath to Rex from birth toby book I think we I don't know if it'sin PDF otherwise I will have it scannedand we'll donate to work stock I alsohave to have the O's 2.0 technicallibrary Rex book so our stew came withan enormous amount of documentation itwas like this and I remember being anold to systems programmer not beingallowed to read those books because theybelong to another department of thecentral bank so I would have to sneak inat night and for a number of days thatstack of books justso when smaller and smaller because Ineed them all and brought them home andI still have them all it was not reallya crime because the people who have thatseries of books didn't understand aboutapi's or they get conventions or theallure of the imports anyway so I don'tthink it's it's it's not the bad thingthat I confess to this now I work atanother place by the way so and ofcourse after having Bates tuned allthose executables it ran like a dream itwas actually very fast still don'tremember than anybody remember the nameof the utility because I mean we had tonote the sequence in which the page werepages were loaded and then we could tellthe language editor to actually writeout the executables in that order whichmade an enormous difference and ofcourse the we celebrated this withchampagne only some of my ministersforgot to tell the directors of the bankand Inter pay and the project wascancelled at the cost of 50 millionguilders then because we didn't haveeuros then and that was only theparticle proved because actually it's itwould have been much more expensive sowhat is Rex it I don't have to tell youyou all use Rex and sodid we start our rex history on themainframe people are here VM CMS peopleover here are their MVS TSO people okayexcellent you're the only one apparentlyless people than I thought because Ithought about the old people I was toopeople are from glue shops and I meanIBM first told you to run a mainframeand then they told you to run visitedthose two and then they told you to runAIX fortunately all of them have racksas a scripting language it was aninterpreter first for very many years itwas let me not tell almost lights andneutrons the most important part of itis that it's meant to be easy for thehuman user and not for the personimplementing the language translatorbecause you see lots of languages thathas have semicolons at a fixed placebecause of then you can scan the line atonce and you have very many programminglanguages that give you 850 syntax errormessages if you forget one of those andPascal is one of the horrible examplesof how you can forget only one thing andthen have pages and pages of errormessages I remember having to deliverPascal in punch cards at university andthen receiving back my error reportswhich were like this we axis isthe scoping is different so you only getone message and you can actually put apointer on the on the offending positionand that's only one of the good thingsso one of the technological advancementthat made that possible is that it wasthe beginning of the network area eraIBM had fie net and all of the firstreaction was were connected by a net andthat made it possible to implementreacts in a entirely different waybecause actually first thespecifications were mailed around toeveryone and then everybody could havecomments and advisories on that and thenthey actually the actual implementationtook place so actually it's thisinspired the the human aspect of thereacts language of course it's not onelanguage anymore I mean at the momentyou build the second interpreter youhave have slight differences of courseand you can try to hide them intofootnotes in the manual but if you go todifferent machine types and if you go todifferent character sets then there arebound to be differences and so Rexactually is family of languages nowadaysof which you can say the granddaddy isthe VM CMS implementation which isleaning a lot on VM constructs likequeues and stacks those we didn't haveat the TSO I met Rex myself around 19891990 when I was an MVA systemsprogrammer and in tears Oh extensions -I never forget today there was thisthing called Rex and you could make yourown small programs and it didn't look atall like c-list anybody use it orremember see list it's another kind ofscripting language probably probablyprobably probably a much throughoutfulness so a scripting language is akind of a glue language that can controlseveral applications and I think thatstill where Rex is used the most andsometimes you can't sleep and you thinkabout how does it come that Rex isn'twidely popular like let's say Java or Csharp or to mention all the dirty workand one of the reasons is most of theRex I encounter because I'm still anactive mainframe consultant at leastpart of my time it's because nearlyevery important application or gluewithin applications is written under theradar by some systems person who isactually not allowed to programapplications but you know it didn't runand we'd like to try to help out andwell you can have this piece of scriptbut you can't tell anyone and I mean ifwe took Rex away then the whole worldwould collapse because all the creditcards and the funds transfers and andthe payment systems they would all fallover because apparently there are all inkicks Global db2 CICS for the Englishspeakers six for the German speakers andin reality lots of that code is Israelwritten by old guys sometimes withsandals and long hair beardsso it's it's an under-the-radar languageit's not known to management and so youencounter it at your job is Wow is thisalso rest I mean this is an importantcredit card company so this this part ofthe makkac and the encryption is writtenin reacts Wow are you going like thatand there's of course a lot of peoplefrom India who email you or call you inthe middle of the night and says I havea question about Rex how do you do thisin this so it is a life but it's notlike everybody is trying to be part ofthe networks Language Associationbecause I mean most of tini people dosee it as work well you get hismainframe application if it came fromEurope or it came from the states now wehave to do it and what's this thing it'scalled Rex ok great so early scriptinglanguages and Rex is one of the earliestof the scripting languages we had DickelI think a few years before Rex and wehad Perl for few years after Rexwe actually had Larry wall who wasworking at NSA then at one of theearliest Trek symposia very he was verybrave because we still had rec symposiaof 200 250 people and it's now more like15 or 20 and VI will be really reallyhappy if I had a room like this likewarp stock for directly names conferenceLarry wall who single-handedly told usthat Rex is a bad language he waswriting a better language it's go Perotand we know how that endedactually much more successful directs innumbers of installation and actually inreadability of God's way worse inreaction because I mean if I have tomaintain some piece of world somewhere Ijust see what it does and write a newone because it's really write onlylanguage in my opinion compared to regsso how did it come about in 1979 MichaelShaw he was working at IBM source leafFactory actually in the department thatmade those nice collar terminals thatwere extremely expensive and very niceblue collars and reddish and they hadclickers under the keyboard so she Imean this was before the the system MPboards that I associated with those twowe had clickers in the keyboards and hesaw a language which was called exit 2in VM and it existed mostly of ampersandand he tried to make something like peel1 but then simple and as an interpreterand not the compiler peel one has aseparate history and very lots of lotsof nice anecdotes but it's for anothertime so actually Rick's is an attempt todo a very small peel one the big one oneof the peel one compares actually cameout of verse knee in those days so Ithink some of the inspiration wasgleaned from its source code and it wascalled red suit 1 X and then the IBM LawDepartment said well you can't have itbecause there's another project aproduct it's called Rex nobody sells itand it's probably dead but we can't runthe risk so they spent a million dollarsin adding that extra X and the backronymthem was invented McCarron name is ofcourse something that is after the factestablished as the restructured extendedthe executor acceptor was its what isdaddy and the thing is it came out moreor less at the same time I mean you hadone VM released that says oh we haven'tscripting right now it's called exit 2and then the next decimal release of VMsaid but the scripting language was nogood and we now of Rex Mike was actuallyfired first and then rehired andreprimanded and like large bureaucraticorganizations like IBM and the SovietUnionyou know the guide the Russian guy whosaved all our lives by not pushing thenuclear button him he was he was put injail and then he got a medal and soMichaels fired first and then he wasmade an IBM fellow which is the highesthonor you can have as an IBM er whichmeans you can actually do do anythingyou want and actually I have a team ofpeople to do what you want and stuffwhen we get to networks this is animportant detailso x-acto was made out of em percent andthe the brilliant thing Mike thought ofwas to turn that around let it have Boone base index and things he didimportant at that time which areactually important because firstly madeone of the first decimal computers Imean later computers or binary the firstones were decimal and the thing withbinary computers is you always get wronganswers more or less I mean if you getrounding errors and you're floatingpoints are no good so he put inunlimited precision arithmetic which isstill one of the reasons that if youhave financial applications it's verygood to use rec for that this was purelysoftware based decimal arithmetic andthat meant of course that if you havelarge positions you can have unlimitedpositions but not really unlimitedbecause sometimes your memory is goneand other times it just takes too longto compute at all certainly in theprocesses that we have in those daysdebugging has the power this has a tracetool and the trace tool is veryimportant because it automates yourprint statements and as probablyeveryone knows full screen debugging isnice and it looks very interesting andif you have a setup in which you candebug something on your own machinerunning on the arm time it's it's aninteresting concept but most debuggingof server and nowadays cloud programmingis done by print statement so trace is away to automate your print statementswhich is a nice form of the buildingparsing has a power statement which isnothing like regular expressions itstemplate based you probably all knowthisand because pl-1 was such an enormouslanguage I mean nobody can really learnpeel one because I mean the stack ofbooks is rather than always to stack ofbooks and it's only the only the onelanguage so keeping the language smallwas one of the important goals in thebeginning and everything is string soall numbers have strings also so you inclassic Rex which is the oldest part ofthe family of Reckling which is you onlyhave one data type which is string so VMthat I told you about first documentthen implement there are actually twopeople who have the honor of being thefirst Rex user one of them is lessGoogler the secretary of the languageAssociation and the other one is Raymondso and I don't know him but these arethe people who first used that tape thatmark sent around so 79it was started actually mike was waitingon delivery of an acorn chipset kit butthat delivery was late and this is whyhe decided to use this time in writingthis interpreter the importantconclusion is that if acorn they deliverthat the prototype gate in a timely waywe probably never who the front haderection history would've look differentat least for me soin 83 it was an official part of VM themainframes operatic system if you speakto younger people they say you meanVMware no no there was another VM beforefreedom where this was IBM's main forhim I think and 1890s oh and for thismeeting very relevant 1990 it was onextended edition I was too becauseMicrosoft couldn't do in these old Imean the extended part was the thingthat had all ABM stools in it's like SNAcommunication to connect to feed themdb2 and there were some other thingsprobably there was a very niceISPs like user interface kit what whichwas later donated to microphone I thinkandthis is probably not reasonable but it'sthe first Rex reference summary with 1xstill because we used to have I mean ifyou asked another systems programmer forhis green green card then you didn'tmean his residence that did mean his carthat Hettie mainframe instruction set onit and your hex to acidic tables andthings so did it but it was Rex's firstgreen card so now other people got thenews and started to implementinterpreters Rex didn't get to pc dosthis was because personally didn't getbudget for pc and the task of writing pcbecause reacts was meant to be in the 81in the first IBM pc this went wrongbecause I think Center Teresa labs gotthe assignment and the important PCprototype and they didn't deliverreaction time it was a few monthsdifference but for IBM that's enoughokay no no we didn't have it so andactually it took till door 7 I think toto include Rex and I never saw that soif someone has about seven around is itactually is it in the dose that is in aconversation or ARCA always does anybodyknowit's not you've got it yeah okay greatso you can use works you can completethe disconnects time somewhere forhistorical purposes of Eric's languageassociationdirectly after six andvery cheapone six two twoyes and one keeps everything that everhappened safely on CDs and in the cloudnow so other people started to writereacts interpreters one of the first wasMansfield Riggs which was the product hecould buy it and then you would haveracks on doorsanother interesting thing is a wreck forthe Commodore Amiga because IBM likesome of our BM was in that time alreadywith Microsoft and thinking about thegraphical user interfaces they liked thestuff on the Amiga anybody had an Amigayeah okay great so they liked it andthey swapped some amiga technology forthe Rex interpretive source code so thisis how Amiga got the Commodore Amiga gota Rex people I speak about it are veryenthusiastic but Amiga and it's justlike like a sweet old silver now if ifpeople were wiser and we still wouldhave Amiga or our store liked itso and then it broke loose of coursethen we got ten non-stop we've gotdifferent forms of Unix AIX got anofficial IBM Rex versions from Endicottlabsninety-two those were the first opensource like implementations Rodinabecause it's from Scandinavia and reksaiMC is from a guy called Egan in Englandwhich is good to me you can still run Ithink it on the most extensive set ofoff I mean if you find the platformsomewhere you can probably find therigging to compile on itits usual configure you to make and itit will probably run it's maintained inAustralia by mark wrestling so when allthose interpreters came up and peopleneeded to speak to each otherthe reacts Language Associationsymposium was organized and this wasfirst for compiler and interpreterwriters first IBM was working oncompiled and started up in - Israel andwas completed actually in well have tobe people from Austria because if you ifyou tell to the Austrian labs peoplethat it was completed in Vienna thenthey are very meticulous I know wescraped the stuff from Israel and webrought all new things so actually thecompiler was the compiler is running onVM CMS and T so that's actually the onlyIBM product that still runs a niceprofit except for our stew and the Orcalicenses now I thinkI never I never I don't know if if I wasto ever came into the black because Imean I know enormous amount of peopleworked on it for years and years andyears and I don't know if it ever but inany case that the compiler does stillearn a lot of money for IBM and in 1919all the first implementers and compilerwriters met and said well this is a goodidea let's do that every yearand that's also the beginning of the Rexlanguage association so Rex wasstandardized as an official an emptylanguage which and he became I so Ithink and I so became something else butit's standardized I mean it's just likeFortran and COBOL and other are thekinds of language that has an officialinternational standard and you have tolook very hard to find one of theinterpreters that actually meets thatstandard again is coming closest becauseRegina has stuff like others withbuilding to it it also has the 3-milefunctions that didn't make the mainframeversion ever because they were a fewdays late and the source code repositoryat Endicott was closed at a certain dateand Mike said oh but I have thisthree-mile and I said no so that never Ithink that always or cos if you want todo to actually includes those things buthave you never told anyone so good andI've mistakenly uploaded one of my PCprograms and ran it and then I thoughthey it's working but you can't count onit because it's not installed and youknow how mainframes are you want to usea certain function that you have to goto the system kind easier to know it'snot allowed there you go so 89 we hadthe compiler the compiler is actually avery nifty thing because the humanoriented syntax that makes Rex such apleasure to use makes it actually veryhard to write the compiler and peoplehave come slightly met over that but inthe end they they just fixed it and itruns so that gives you performanceimprovements mainly for things that areautomatic and internal to the languageand fortunately Rex is used a lot tocall external things well that's notthat fast if you call the compiler Imean you you have to do you have to domore things actually in compile code soif you are just using it as glue thenyou might as well just interpret it theother thing isif you sell an application you don'twork people to have to source then youcould compile it and it will be bigrecognizableat a certain point in our historyobject-orientation came into play sothere were committees that tried todecide on how should be object-orientedalso there's a bit of a generation gaphere and there are a lot of mainframepeople who never want to useobject-oriented at all and there are theyounger people that don't know whatobject-oriented is because it it wasthere when they went to school and theywell this is how you do it and actuallyin Rex the difference between objectsand classic Rex is not that great I meanyou call a function and you specify whatto do it on and in object X you say whatto do it on dot call the function andleave the other thing out I mean that'sthe big thing and that one simple changethat to a whole different way ofprogramming in which you can keep yourcode and day time to you know aboutobject orientation and if you don't youprobably won't like it ever so theimportant thing about object X is it'snot done by my call the show and I thinkhe kept quite too long about things hedidn't like about it it's gotpunctuation things like tildes twiddlesand scrap things with double columns init and those are the things thatprobably he didn't like from thebeginning but he didn't want to offendsome and Nesuhi was down the hall fromhim and the important thing is in ourstew you have both I don't know how it'sdone now but as I remember and I'm frompre-warpfrom our manuals to activity you wouldget a sweeter excrementin which you could say well I've gotobject Rex also and it would be entirelycompatible with classical Rex with onebig difference because the classic Rexjust parses line by line just draws inthe line looks at it and execute it ifyou have some syntax error in the partof your program that you don't use youcan't run it on the object Rex becausethat drives to parse your own program isas well sorry line numbers such-and-suchwhich you didn't know you would neverhit as an error in it that's thedifference it wasn't a big commercialsuccess because Rex was gone into I meanif you if you look at Google Trends atall the versions of Google Trends yousee Rex peak in about 1995 becauseeverybody was talking about it if regardwas talking about your version of itthere was talk about IBM open sourcingit I was talked about having Linuxversions that that all took a number ofyears and IBM changed it was for examplethe acquisition of Lotus that thatmatrix a bit of a second-class citizenin those days and the important thingwas that the development laboratory wasmoved from Endicott where other peoplewere who just made the product wasenough to do burbling in Germany withoutany of the people working on theinterpreter so that was that was therewas a really bad move for continuitybecause I mean the German people arevery good they still are workingprojects but they needed a year a yearand I have to just get acquainted to thecold days actually calling in peoplefrom Rex LA to tell them while we've gotitthis thing from Endicott what is it sothen it was decided to put it into ourstew but sell it for Windows and theyworked and don't know if anybody boughtthose there was a CD with only theinterpreter any CD with the developmentEdition which had a kind of precursor ofEclipse and it had a resourceconstruction kits and you could makepresentations of programs with it andstuff never sold very well and itactually died off a bit during thosedays2004 I heard that IBM was actually goingto discontinue all development and assetand we asked nicely if we could have itso that we could keep on defending bringit for other platforms now the thingwith all is - of course is all storesanother cloud baseit's owned by the work left of the O's -team in the in the icing Department it'sgot lots of stuff from other people init's just the same story so still theO's - reacts never can be open sourcebecause nobody knows which part of itsare Microsoft and other companies whichpart of it are Amigawe just don't know so what we inheritedfrom IBM as Reza reacts languageassociation it's the source code to theLinux windows and AIX version which westill maintain we added my co-host andactually it was born on this machineversion on it and there is a linux forthe mainframe version of it now it was anumber of times it was rewrittenactually by the retired IBM us whodeveloped it from Endicott Rick McGuireand and his team so it was actuallymaintained by IBM us outside of IBM thegood thing is you can download thesource code build it yourself on yourmachine see how it worksfix some bugs for us which which wouldbe good because we are not commercial soit's it's it's an activity that has animportant negative income actually so ifpeople would like to help out andcorrect some documentation thedocumentation is the professional IBMdocumentation so we've got a stack ofbooks I mean if you print them whichnobody does anymore nowadays but thereare PDF they're very nice and also theinterpreter all Rex has had someproblems from the beginning and I don'tknow if any of you used it to do a lotof i/o during the day and notice that itgot a bit slower than that was becauseof memory management issues that were init from the beginning and I think wenearly have them all now but we took ourtime now remember I told you about andtell me how I'm doing for time because Icannot gruffly end it we can just go onI can just talk foreverthat's good so I need two minutes untilit's 12 o'clock the other Rex that wehave now is networks which is a thingthat Michael showed it while he was a BMfellow he said wouldn't it be great tohave Java on IBM platforms because wehad articles in the financial times itsays iBM has five different platformsand enormous costs to develop things andthey should focus on one thing well theysaw some Java Mike and a friend of hisactually were the first people whoported it within IBM to always - thatwas the first general port in IBM andthen he thought well what would happenif I would try to because nobody likesthe syntax of Java even James Goslingdoesn't do like it he told me himself hesaid well we were a company that soldC++ compilers I was trying and he didfirst the bytecode parts because he justhad ported six UCSD Pascal things todifferent internal architecture so hedid the byte code from Javait was designing his high-level languagewhich would look a bit like scheme orsmall talk and then his management saidno not would have to be C++ this ofcourse didn't happen once because whenpeople atthe browser company Netscape wordavailable in JavaScript it was just itneeded to look like Java it was alsomeant to have another same text morehuman oriented and things so thisaccident happened twice in our historyso networks is a form of Rex which isnot entirely compatible with classic orobject but close enough I mean if youknow your swing functions and your otherthings you would be very very at ease inprogramming networks but it compiles toJavaand since the turn of the century itdoesn't only compile it also interpretsbecause for a lot a lot of things youdon't I mean you just want to change itand then run it and if it's glue or itstarts something and gets the outputthen you just interpret it so it's atranslator because it's a compiler andan interpreter so reacts is a bit allfor itnope but it still used vitally well butwidely and mildly probably also classicRex is still aiming there's no realother choice on the mainframe so if youhave to do mainframe like lots of Indianpeople you need to do Wrexham thisnobody helps you open source well lifehas just begun because both of theimplementations networks is open sourcein 2011 so both of the IBMimplementations and offering in opensource you can download them fromSourceForge one is a get the others insubversion repository and you can buildit yourself for networksyou only need and networks I am NOTgoing to repeat the things that are thesame likearbitrary numeric position and thinksit's got the trace you can use the barstatement to do things like like Lispyou have the same trace you can theinteresting thing is you can use forexample all Java libraries to makegooeys like swing Java fix and if youanalyze the things it turns out that youneed more or less of 40% of all yourtyping to do the same thing in networksas you do in Java so it's organized likean interpreter now but it can compile toJava and you can use it in the kind ofscripting mode which means you don'thave to define classes with methods init you can just put the statements underit the translator will recognize thatand translate it into Java that doeshave classes and methods and otherthings that the Java compiler needs tocompile it's a very small addition it'sabout 45 K in addition to your Javainstallation and you can run network'sprogramsof course the translator itself is a bitlarger you can use everything that's inJava so if you want to have grammars andentler or any Java library is justtransparently callable from networkscode you don't have to define it or itwill find it it will link it it will doit the interpreter we told you about ithas some things like Java Java hassingle inheritance and it's a bit of astatic language object Rex is totallydynamic we know Peter she can say giveme an object and I'll define somemethods on it and then run them that's abit harder because of the Java VMstructure to do that in networksnetworks was born on august 2 as an oldto rex program so it was first the Rexprogram that put out Java commands andthen the Java commandsform the compiler that could compile thenetwork's language as defined so it wasbootstrapped so network is now writtenin networks which makes it easy becauseI always deliver the last version withthe source code because you need thecompiler to compile itself there itmakes for an interesting type of errorin which you blow the language so thatthe old compiler doesn't work anymoreeither something you have to you have toalways safe keep one and we do that inversion management so don't worryit's bootstrapped every major languageis good served of course and we did opensource it that took years and that tookme years of my life it is then that thegrey hair started to appear like becauseif you speak to IBM legal departmentthose are a different kind of people andthen if you think after one and a halfyear you have explained everything theysay oh by the way this is my last weekat IBM you'll get this new guy and thenthen the new guy goes like oh it's aprogram language it's something like plsoh it can't be open source so you haveto start all and all and so that tookfrom 2007 to 2011this is still the book to have you canstill order reprints from Amazon and youare at the end of this presentation withsome URLs if you're interested I canhave it if the demonstration effectdoesn't hinder me I can do quick compileon a conversation and which I have tomove to the other window of course maybeI have to tell it to miramar this placebecause I'm still running I was still onmy neck it's just because I meanreckless born on always too and I thinkit's just a token of respect that wejust make sure that it still runs inevery version that we bring out so letmeyes so we just built a new networks andthen inI have to capture the mountain of courselet's say we would like to compilesomething under Oh still we have aneditor and then we do say summation markalways important not to make too many sowe save it we exitand then we could pile it no networkscompiled very quickly close to the ferryI mean it's it's running on the VirtualBox now but it's so much faster thaneverything that you've run natively onthose machines so then we could sayhello and then gets the results of our Imean it was a Rick's program I mean youknow that it looked like Eric's programbut it is you have a jam for classbecause it produced the Java source itcalled Java compiler and it made anexecutable Java class for you so I thinkI'll leave it at thatby the time if there are any quickquestions and then probably you can yeswas Dinodifferently doing Rex Rex that's why wecreated that took asorryyeah because well the question was forthe people I think online is is thereany good list good and usable list ofdifferences between networks and recsand I would say well there's excellentnetworks documentation and I think youcan see from the differences what thedifferences are my advice always is notto try to recompile too large programsbut very small programs because for datethere is no real networks implementationbecause it was decided that Java didenough with dates so you should use JavaState now there is and that's the goodnews there is a compatibility packagenow which has the date versions likelike Rex uses them they will be part ofsome future release of the network'scompiler so to answer your question butwe're very sorry and no there is not acomplete list but we do try to fixnon-obvious defects like thisokay well thank you very much and otherquestions we'll just do during the break