Running X.3 on a G4/800...
I envision the following: My wife is logged into her account in OS X. With a VNC client on a sub-notebook, I log into my account over my wireless network, and we both share the computer's resources while each seeing our own account environment. Is this possible with VNC and OS X? I know OS X is set up to be "multi-user," but I'm not sure if more than one user can be logged in and running the Finder and other applications at the same time.
VNC sees what the monitor sees. I really don't think that is possilble. I know that it is possible like with WIndows 2000 and 2003 server. When you RDC into those boxes, you can be doing one thing while the person logged onto the box can be doing something else.
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The UNIX versions of VNC can do as you describe, because they they basically emulate a complete X server on a private frame buffer. The OS X and Windows versions are just screen scrapers, however.
In my investigations I turned up something saying that the UNIX VNC server can be installed in OS X via Fink, but it will only work serving X11 programs. So perhaps might it be feasible, but I wouldn't get the traditional Finder and desktop, and I'd be limited to whatever X11 programs I can scrape off of Fink.
On the other hand, I just ran Fink and I don't see any VNC programs on there. So perhaps not.