For the OP: If you want to launch one compiz per screen, you can do so by running DISPLAY=:0.0 compiz --only-current-screen DISPLAY=:0.1 compiz --only-current-screen
For the OP: If you want to launch one compiz per screen, you can do so by running current- screen current- screen
DISPLAY=:0.0 compiz --only-
DISPLAY=:0.1 compiz --only-