Programmer credits:
Press [Ctrl] + [Open Apple] + [Option] + N at the "Check startup device" message when the computer boots.

Change cursor:
Press [Ctrl] + ^, then press any key. The cursor will change into the key that was pressed.

Hidden monitor commands:
Enter the monitor then enter #, "Memory Peeker" and "Visit Monitor" options will appear on the control panel. The "Memory Peeker" option allows the stack and any memory location to be examined.