i want to let users to log without username or password

i want to let users to log without username or password . depending on IPs. only
Can i do this . ?
please help
Thanks.

you mean in HotSpot or where?

yes i mean in HotSpot

possible with MAC addresses. search for MAC in here:
http://www.mikrotik.com/testdocs/ros/2.9/ip/hotspot.php

hi Mr. normis
thank u very much