Imac LCD Question

I don't think this is possible, which is why I probably didn't find anything on my web searches, but can you hook a desktop such as a G5 PowerMac to an iMac and view the two desktops on the one shared screen? I mean I figure I have the 20" screen on my iMac to share...

Is this possible?

Thanks!

Nevermind, I Looked Further Down Here And Found The Answer, Which Is A "no."

This would be a great enhancement for a new iMac release. It is certainly an oft requested feature here in these forums.