Apple PowerBook G3 - Manual (Page 119)

Special key combinations
If difficulties with your trackpad or computer don’t allow you to use standard
methods of quitting a program or restarting your computer, you can try using
these special key combinations.
To do this... …press this key combination
Force a program to quit x -Option-Esc
Force the computer to restart x –Control–Power key
Here are other key combinations you may find useful.
To do this... …press this key combination
Start a “debugging” application used x –Power key
by software programmers*
Rebuild desktop Shift key (while starting up); release, then hold
Option-
x
*If you do not have a debugging program installed, your screen displays a right angle-bracket prompt (>). To return to
the desktop, press G, then press Return.
119 Using Your Keyboard