monitor the Bandwidth Usage per user

hi all, I want to ask the question that is it possible that i can monitor the Bandwidth Usage per user in Router OS or not, like in ISA server with Bandwidth Splitter.
If it is possible, please tell me

thanks

Let’s try to keep this on one thread. This one:
http://forum.mikrotik.com/t/bandwidth-usage-per-user-in-router-os/46768/1