Batch File for Monitoring

I set up Untangle last week based on the suggestion of another poster. It works great, but it sends me the details of “who’s who” on my largely DHCP network in IP’s, so knowing that user 192.168.1.23 did “whatever” doesn’t mean much.
I’d like to go a step further and create a batch file that tells me who the users are and what their IP’s are so that I can match up the problems to the people.
Problem is I haven’t written a batch in twenty or so years (maybe there is something better? but a batch just seemed simple and convenient). Maybe having it spit out to a text file would be a good too?
Any ideas?

The O/S is Windows XP, almost everyone is DHCP (a few dedicated IP’s, like printers), about 35 users.

Many thanks.