NAME
	query_ip_number - get the ip number of a user

SYNOPSIS
	string query_ip_number(object user)


DESCRIPTION
	Return the ip number of a user, as a string, or nil if the given object
	is not a user object.

SEE ALSO
	kfun/connect, kfun/connect_datagram, kfun/datagram_challenge,
	kfun/query_ip_name, kfun/send_datagram, kfun/send_message,
	kfun/this_user, kfun/users