I just installed a little program called Synergy, which lets you share a keyboard and mouse between multiple computers. It’s as though you are using a single multimonitor system, except that each machine is still running its own OS. Move the mouse off the edge of one machine’s screen and it will pop up on the other; the keyboard drives whichever machine the cursor happens to be showing on. Terrific! Now I have cleared the great big black ergonomic monster keyboard off my desk and only the sleek aluminum Apple keyboard remains. It’s prettier and much more comfortable.