Network Management Tool
You don't have to perform many management tasks on a peer-to-peer network. You might check shares or double-check file access on a computer; but for the most part, a peer-to-peer network runs itself.
However, Windows does include a few management tools you may find useful. You can use these tools to see who's sharing which files, who's attached to which computer, and so on.
Understanding Network Management
Using Windows Monitoring Tools
Using Net Watcher
Monitoring the network with Windows XP
Using System Monitor
Monitoring on the Mac
Linux Network Monitoring