Hooking to window movement

[Keith Edmunds]

Is there a way to hook into a window movement?

What I want to do: I'm running a two monitor setup. I want all windows
that are on the second monitor to automatically be on all desktops
("sticky"). So, I want to do something like: 

	IF 
		Absolute upper-left X > 1920
	THEN
		wmctrl -b add,sticky -i -r 0x.......
	ELSE
		wmctrl -b remove,sticky -i -r 0x.......

Then, if I move a window so that it is entirely on the second monitor, it
will be sticky; if I move it back, it will revert.

Doable?
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