Hello 'World',

There are two points that cause me problem in this file :

1) What does 'FASMWIN32 ' and why not use STATIC example?

2) At what point is launched WindowProc because I see no conditional jump to get there ?

Thanks for help.

1) FASMWIN32 is a class name for a main application window. Main application window should not be a predefined class, like "STATIC" or "EDIT" or "BUTTON".

2) If you seach the code and check where else "WindowProc" is mentioned - you will see that it is used to initialize WNDCLASS structure, which in turn used to
register a class name ("FASMWIN32"). Basically, you telling Windows: "Here is a pointer to WindowProc function, call it when needed." That is how it is "launched". There is no jump to it - Windows calls it for events, or messages, which are the basis for any windows program.

thank you for help, but the second point is quite complicated to understand for a beginner .Would there be a place to find more detailed info of help?

Try this site - it seems a good place to start:
http://www.win32developer.com/tutorial/windows/windows_tutorial_2.shtm