Here is a piece of the code I use for a client when updated their McAfee virus definition files.

code:

---

               ? "Updating virus definitions.  The version being installed is: $newversion."
               $selection=Messagebox("The virus definitions on your computer are being updated.  As a result, your system may reboot itself.  If it does, just login again.", "Important Notice",4160,7)
               Shell "$comd $newversion /logfile %TEMP%\mcafeedat.txt /silent /reboot"
               ; The system may reboot here.

---

If you look in the manual at the messagebox definition, the fourth parameter controls how long to keep the message window open (I also don't display the desktop and make sure all other windows are closed before this so the user can't change the focus).

Hope that helps some.

------------------
Regards,

Brad
Consultant
Net InfraStructure, Inc