OK, so today I had a reason to try Mac OS X Leopard's Screen Sharing feature with my wife's MacBook at home. We initiated the Screen Sharing via iChat. Once she started the screen sharing with me, I was able to take over her Mac and do what I needed to do. I then took it up a notch to crazy and screen shared our kid's iMac G4, running Tiger, to control that Mac. It was partly because I needed to and partly because I wanted to see if I could do it. As you can see from the screenshot below, I was able to create this triple-Dock madness and perform my mad experiment successfully.