The rope you can see in the pictures fastens to the 3 pt toplink claw, the weight of the toplink keeps the claw open, I can adjust the toplink while dropping the claw on to the top link implement ball once the claw drops onto the ball it should latch. Some times it may not completely latch if so I'll give it a tap while hooking up hydraulics or pto.
It unlatches the same way a good jerk on the rope and its unlatched and I can lift it with the rope, I have a loop in the rope that I drop around the window post to hold it when not in use.