Command to stop ScreenSaver?

This isn't too great of a problem, I could disable screensavers, but wondered if anyone knew how to accomplish this in ARD 2.2. In the 2.1 version, I could lock the machines and unlock them, and that would stop the screensavers, which run after 30 minutes or so. Since upgrading to 2.2 they won't wake from screensavers. If they go to sleep (screens black), they will wake up with the Wake command, and kids come in and can wiggle the mice or hit the space bar, but it would be nice to have them all ready for them with a quick keystroke or two. Perhaps a UNIX command to stop the screensavers? All OS X 10.4.2 on eMac 1 Ghz machines. I looked through all recent posts and read the FAQ. Thanks, Rem