FILE
	/usr/common/lib/mobile.c

NAME
	move - instruct the mobile to move through an exit

PROTOTYPE
	nomask string move(int direction)

CALLED BY
	System, Common, Game

DESCRIPTION
	Cause the mobile to attempt to move through an exit in the
	specified direction.  If the mobile cannot, a reason why is
	returned as a string.

	When the mobile changes rooms, the 'hook_leave' hook is invoked
	in the old location, and the 'hook_enter' hook is invoked in
	the new location.

	You should access-protect your version of this and all other
	inherited functions, including upgraded() and destructed().

RETURN VALUE
	The reason as a string, or nil for success.

ERRORS
	Usually none.

SEE ALSO
	teleport, hook_enter, hook_leave