Thread: API and Rich edit control

I wrote an app for a friend with MFC, but it won't run on his computer for some unknown reason. Anyway, I'm rewriting it with API, but I am not an API programmer, so I need some assistance.

I have a rich edit control and I want to handle the WM_CHAR and WM_KEYDOWN messages (among others) and know that I need to create a separate procedure to handle the richedit's messages, but I don't know how to do that... I've created it with CreateWindowEx(), but how do I tell the app where to send its messages?

Thanks yo.