Frequently my wife calls from home for a little computer help.  She's not a
geek, but is learning fast.  It would be really convenient if I could set
something up that works like VNC on (shudder) Windows, where I could
actually see what she is doing and help out.  Does VNC allow you to attach
remotely to an existing X server or does it create a completely separate
DISPLAY?  What other solutions are there?