FILE
	/usr/common/sys/exitd.c

NAME
	add_oneway_exit_between - Adds an exit between two existing
	rooms

PROTOTYPE
	void add_oneway_exit_between(object room1, object room2, int direction,
	int num1)

CALLED BY
	System, Common, Game

DESCRIPTION
	This function adds a one-way exit from room1 to room2.
	Going from room1 to room2 occurs in the specified direction.
	If num1 is positive, it is used as the exit number for the new
	exit.  If num1 is -1, the exit number is allocated on demand.
	Num1 is usually left as -1 rather than specified when new exits
	are allocated.

RETURN VALUE
	None.

ERRORS
	If the parameters are invalid, or cloning or setting fields fails,
	an error will occur.

SEE ALSO
	direction_by_string, remove_exit, add_twoway_exit_between