Hello, i am a freshman of the x programming. In fact , i spend lots
of time on x these days,but i still dont think i grab the key things.

The things confused me most are those about Property,Atom,Selection
and so on,i cant
handle the InterclientCommunication and the WindowManager Staff.

Now, i want to make a programme like the gnome TaskLists, to list all
the current xclients to the user.But i have no idea of how i could get
to know when a new client start up or a current client shut down,
Should i get some event form the WindowManager? Or should i do it
through some other way?

Please give me some advices, Thanks a lot!