Symptom
Using the keyboard shortcut Command-Option-Shift-Q in Mac OS X 10.2 while using the Classic environment immediately causes the Classic environment, and any applications open it, to quit without warning.
Important: Any unsaved data in open Classic applications will be lost when the Classic environment quits.
Solution
Update to Mac OS X 10.2.5 or later for improved reliability.
You should avoid using the keyboard shortcut Command-Option-Shift Q when using Classic applications. To restart the Classic environment click Restart in the Classic preference pane.
Note: This only restarts the Classic environment, it does not restart the computer.