How to set script to "pause" from within the script itself

Hello everyone

A user can pause a running script by clicking on the tray icon.  What I would like to do is to set the script to "pause" from within the script itself, so that the user is forced to click the tray icon again if he wants the script to continue executing.  Is that possible?

At the moment I "pause" a script simply by using MsgBox, but I was wondering if it would be possible to pause the script for real.

Thanks
Samuel