FILE
	/usr/common/sys/exitd.c

NAME
	get_exit_by_num - get an exit by global number

PROTOTYPE
	object get_exit_by_num(int num)

CALLED BY
	System, Common, Game

DESCRIPTION
	Takes a number and returns the corresponding exit object,
	which may be queried as usual.

RETURN VALUE
	An appropriate exit object, or nil.

ERRORS
	If an invalid number is passed in, an error may be returned.

SEE ALSO
	get_exit_segments, get_all_exits, exits_in_segment