In OS X, take a look at the System Preferences and you will see the Universal Access icon. That will allow you to do all the things that you wish to do.
Hope this helps
Anyone know of a utility program for OS X (Panther) that would allow one to zoom in on your display? I teach and being able to zoom in on a particular screen display is very useful. Mac OS 8 - 9 allowed an Apple control panel to do this. Unfortunately, it is not supported by Classic.