foreground/background window

Hey,
I'm trying to create a dialog based app. that when minimized (or in the background), can control the foreground window (whatever it
is) and minimize/maximize/close it depending on keyboard input to the background app. How do I grab control and use input on the
foreground window via my application?

I'm trying to use SetFocus(), GetForegroundWindow(), etc., but need an example series/usage or something to get me rolling.

Thanks very much,
Chris Glass