The ACCELERATOR3 is an action attribute defining the third accelerator key for an action.
Syntax 1 (Dialog action handlers): N/A
Syntax 2 (ACTION DEFAULTS section in form files)
ACCELERATOR3 = key
Syntax 3 (Global .4ad action defaults file)
acceleratorName3 = "key"
The ACCELERATOR3 attribute defines the keyboard combination that can be pressed by the user to send an action to the program.