How to determine that a screensaver is running?

Question

One solution that one could suggest is to periodically look for a special \'Screen-saver\' desktop, and if it\'s present then count it as a running screensaver.

But

Answer 1

HOW TO: Determine If Screen Saver Is Running by Using Visual Basic 6.0

I know this is for VB6, but it's bound to be a good place to start.