Default value
MOUSE_ACTIVE_POINTER (1)
This defines how the mouse looks when dragging this object over another object that has mouse_drop_zone set. The default value enables the addition of a standard “droppable” indicator to whatever mouse_drag_pointer is (unless mouse_drag_pointer is turned off).
This variable may also be set to any of the other built-in mouse pointers, or a custom icon or icon state. If an icon state is specified, this is applied against the object’s main icon to find a custom pointer.
Note that all mouse pointers are purely visual indicators. They do not effect what objects may actually be manipulated with the mouse. You control all of the real behavior in the associated procedures.