Grabbing the desktop

Whats the fastest way to grab the desktop as a image on a canvas?

Tried the Chaos.Desktopext mod and its just not fast enough for my needs. B+ managed to grab images very quick. Any ideas?

Theres some code in this thread:
http://www.blitzbasic.com/Community/posts.php?topic=58824

Don't know how it compares speed-wise, though.