In Command mode or DMIS mode, groups that contain commands set for execution by a specific arm will have the same red and/or green Multiple Arm Mode margin markings as those commands.
If all the commands in a group are tied to one arm, the GROUP command also has the same margin color markings. If you then change the arm mode of the GROUP command, all commands inside switch their margin color markings to the other arm.
If one or more commands are tied to both arms, the GROUP command also has the same margin color markings as both arms.
For information on Multiple Arm Mode, see the "Using Multiple Arm Mode" chapter.