X-Windows Enumeration

Hi,

I'm new to x-windows system and I have a few questions:

1. How can I write a C program to enumerate all the windows on the local and remote computers? In other words: How can I create a list of all the windows in the system (maximized/minimized/active/not active ....)?

2. How can I recognize events like keystrokes and mouse events?

3. How can I get the mouse cursor position?

All these things must be done in C.

Any help appreciated.
Thank's!

Have a look here:

www.x.org
www.rahul.net/kenton/xsites.framed.html