I want to know how make .DLL (in subdir MODULES)

[Vladimir_BL]

Greetings !

I'm a begginer in FS and I want to know HOW I can make add-on for FS (some .DLL in subdir MODULES) with C++.
Can anyone give to me URL where I can read about interfaces with MS FS and may-be some source examples.

Thank you very much.

Vladimir_BL