 Let's take a look at the simplified API documentation. You need to open the bookmap installation folder. Not the working folder, that's important. For Windows, it's typically C drive, program files, bookmap. Open the folder named lib. There should be a file named bm-simplified-api-repper-javadoc.jar. You need to rename it to zip and extract to some folder. Now open the folder to find the index.html file. Open it with any browser. What you see is the javadoc for the simplified package. It may seem overwhelming at first sight, but in fact does not too much. What we need to know to build our first module is your module needs to implement the custom module interface. It's a must. It'll give you some objects to work with. Please see the initialize method description for details. Then there are some interfaces to implement to access certain events. They are called listeners because they make your module listen to events like bars or depth. There are also a bunch of adapters. Those are just empty implementations for listeners. You may want to use those later.