|Type in the command center:
This makes the object undraggable. Unfreeze the object by typing in the command center:
To make all objects on a page undraggable, type in the command center:
To make all objects draggable again, type in the command center:
A "frozen" turtle can still move under program control; it just cannot be dragged by the user. (You might freeze turtles in games to keep the user from cheating!)
A frozen turtle or button set to once cannot be stopped until it completes its instructions.