Determining security on an NT server

[Mal]

I need to find a way of analysing an NT server to see where there rights and
security groups are and what permissions they have been given.

The data on the server I am looking at is going to be migrated onto another
server but I need to determine what security is in place in order to migrate
that security across to the new server.

Is there a quick way to do this? maybe with a shareware tool or Microsofts
own resource kit?

Thanks for your help

Mal