How do you Enable/Disable a user's ScreenSaver and set it's time

How do you Enable/Disable a user's ScreenSaver and set it's "Start Screen Saver" time.
I am writting an application in java which uses JNI and a screen saver to lock users out of the computer unless they enter the correct username and password.
If they enter the correct password I need to Enable the ScreenSaver at a specific about of time (time can be changed remotely) so I can "log out" the user.
I need to disable the screen saver after the screen saver runs so that it doesn't run while the java login program is running.
I have this working already on Windows XP but can't find any way to program this on Mac OS X.
Thank you for any help!

http://forums.macosxhints.com/showthread.php?t=61525
Disable
defaults -currentHost write com.apple.screensaver idleTime 0
Enable for 180 seconds
defaults -currentHost write com.apple.screensaver idleTime 180

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