NAME
	unlisten - close a network port

SYNOPSIS
	none unlisten(num)

DESCRIPTION
	This builtin is only functional if LPMOO has been built with
	networking support and the mport_listening configuration option
	is enabled. Otherwise, E_PERM will be returned.

	The TCP network port specified by `num' is closed on the host
	machine, such that no more connections will be accepted.

	If the port was not open, E_INVARG is returned.

	This builtin requires wizard permissions.

SEE ALSO
	listen