Is there a program to monitor AIM on a network without the program being install on the target computer? Just a concerned parent.

Are you wanting content or just to see if IM is open on the network?
content, your probably gonna want a key logger, IM activity, you just need to watch what ports get opened on the router
http://www.chebucto.ns.ca/~rakerman/port-table.html

I have a Zone Alarm Z100G router. All IM is being blocked now. She is begging for me to allow AIM. I might if I can monitor content to see what is going on. I have goggled it and see programs but am afraid of rouge programs.