I need an outline answer to the following question.
I am programming in C# and I need to implement two functionalities:
(a) Retrieve a Window Handle (of some other running application) by
having the user click on it with the mouse
(b) Generate a mouse event that goes and clicks the mouse at a specific location
within the window whose handle I have. Or perhaps within the currently
focused window.

Basically I am trying to implement an application that simulates user behavior.

A point to a site that explains how to do this would be sufficient too.

Thanks

We don't need you doing this for any reason.  Implementing automated
spyware installs should be harder than asking a two dollar question. 
People like you piss me off..

Oh ya, if you look at the win32 API documentation it would be really obvious.