Use these command line switches for WinNT/Win2K service pack installations (update.exe -switches):
-c = Create uninstall directory (Win2K Only!)
-f = Force other apps to close at shutdown
-n = Do not create uninstall directory (do not backup files for uninstall)
-o = Overwrite OEM files without prompting
-q = Quiet mode - do not show user interface (i.e. silent install)
-u = Unattended
-z = Do not reboot when installation is complete
-s: = Slipstream installation method (Win2K Only! - used to include into a CD-ROM-based O/S image on a Remote Installation Service (RIS))

Bill