Apple IIGS Keyboard tricks:

Keys                               function
-----------------------------------------------------------------
Ctrl-OA-Reset                      Reboot
Ctrl-Shift-OA-Reset                Reboot and re-load BRAM (ROM 03)
Ctrl-OA-OPT-Reset                  System test (OA-OPT to repeat)
Option while power-on              Menu to Reset standards
Ctrl-OPT-Reset                     Reboot and give menu
Ctrl-OA-ESC                        Go to control panel
Ctrl-OA-Shift-ESC                  More direct to control panel
Shift 5 times                      Enable sticky keys (ROM 03 or Sys 6)
Shift-OA-Clear                     Enable keyboard mouse (ROM 03 or Sys 6)
Ctrl-OA-Del                        Clear keybard type-ahead buffer
Hold OA, then Ctrl-Del             Auto fire Button 0
Shift-Period on keypad             Comma
Ctrl-OA-2 in GS/OS desktip app     Select "About.."
Control-6, then <key> in BASIC     Set cursor to <key>
Ctrl-OA-OPT-N  at sliding Apple    Credits
          (i.e "Check Startup" screen)