Spike,
Don't you love me any more? You could have called me.
There are *two* possible ways to zoom the entire screen on the Mac. One is "control-scroll." Since Tommy has a MacBook IIRC, his trackpad should be able to function like a scroll wheel by using two fingers instead of one (a very handy feature BTW), so holding two finger on the trackpad and one on the control key will zoom.
The other is the Universal Access keyboard scrolling feature, which can be turned on and off with Command-Option-8, and zoomed in and out with command-option-(plus or minus).
If you want to disable the control-scroll feature, go into System Preferences, click the Universal Access icon (right-hand end of the System row), and where it says Zoom, click the "options" button. At the bottom of the Options screen, un-check the box for "Use scroll wheel with modifier keys to zoom:" But once you know that it's there, it's a handy thing to leave enabled. I was at the Job Center the other day getting a cover letter reviewed, and the guy who was helping me out couldn't read the text on my screen so I was able to quickly zoom in for him. It also makes a quickie-full screen mode for a video on a web page, for example.