Depends on the WM entirely.
Some WM reparent windows, and thus, won't work.
Some WM keep track of windows in-memory and ignore windows deletion event, and thus won't work.
Some WM relies entirely on EWMH, and thus won't work.
Some WM forbid external programs to handle windows, and thus, won't work.

For now, I've only found cwm (and swm, obviously) to fully integrate with wmutils (though some like ratpoison give good results)