Joshua Kidd 0 Junior Poster

Hello all,
I have been working on n Application for a game called Microsoft Flight Simulator X.
And I have seen many Forum Posts of people using Win Api calls to reply to the multi-player chat room, because you cannot access it through an SDK.

Here is an example of a Forum: http://www.fsopen.co.uk/forum/posts/listposts.php?threadid=168

And I was wondering about a documentation about the win api.
or if anyone could try and help on how I would use the win api to maybe hook into flight simulator.

Thanks. :)