 So, there is a QA session for 15 minutes, so you can raise your hand and ask questions to presenters. 1, 2, 6, 9, IER, CEM Institute. Yes. What is the meaning of semaphore in IPC mechanism? Semaphore that is our said variable means if you had that operating system course maybe you all know that is said variable between the two different processes. So, like mutex if you have heard about that mutex that is our semaphore that is the said variable and that is used for to entering the critical section. Double 1, double 4, KCB Technical Academy Indore. In Aakash Tablet we are just using Android operating system, so can you tell me some limitations? So, see the Aakash Tablet has version ICS that is ice cream sandwich, okay so I mean exactly whatever application or whatever is supported till ICS that will only work on Aakash Tablet, I mean that is the only limitation we have because there is upgraded version which is 4.1 jelly bin we do not have it on Aakash Tablet, we have 4.0 ICS, so whatever limitation advantages disadvantages are related to ICS those are applicable to Aakash Tablet that is it. Thank you. So, what does actually surface and audio flinger does in this Android on time process? You want to know that surface flinger and audio flinger, so that is your like they are manager, they are managing like audio flinger that is managing the control of the speaker and your headphone of your device, right and surface flinger is your surface like as I mentioned if you are seeing that battery status or maybe your tower network range, ETC all are displayed by the application, that application will communicate to the surface flinger to display it. So, now you are watching that thing and if you start the another application, okay so this both two application it will contact to the surface flinger and at a time you can see both thing at a time because of that that is the task of the surface flinger and audio flinger that is your if you are started a music on your tablet, so at that time that audio flinger will contact to the this connect with the speaker and you are able to listen it. The software hardware interface or it provides any audio platform to run audio files? Audio files is look this main purpose of audio flinger it will contact to the driver and it will it will contact to the hardware, right so this it is not like what do we say we are not providing it is just an interface to contact to the hardware only. I am not sure about that but if you are cutting off power, so how can your process will get run? One to seven one, Jawaharlal Nehru National College of Engineering, Karnataka. Explain about the parental control over the application regarding the using Android so how the parental control can be achieved without the knowledge of this Android so how the parents can modify the application so and how the you are not to block the SMS inside the college the running the application regarding the usage of internet means web based application such as Facebook or browsing such type of application so how can you avoid the access to those applications can you answer sir? I did not get your question completely but from what I got your question is there are some applications which you want to restrict and some applications which should not be in the blacklist is that correct? Without any knowledge of the application to the parents is it possible so what type of user interface you are providing to the parents to get the parental control? So for the parents they will have to know which applications are installed in the tablet and after that only they will be able to write the policies so if there are ten applications which are installed in the tablet then the parents will have to know that these applications are relevant for the students and these applications are gaming applications so are the gaming applications or any say messaging applications that can be blocked by writing a policy