connected computers

Log into your router.

 

Oh, an airport...I'm not familiar with airport basestations. I can login to my Belkin router and select DHCP Client List to see all connections. My older Dlink was pretty much the same. I'd guess that if these companies have and option like this, then apple would too. Sorry I can be more helpful.

 

Download the Airport Management Tools from Apple - you'll find the link to the dmg film under Additional Resources on the right hand side.

The Airport Managment Utility will show you what other MAC addresses are using your network and log them for you. Also shows you what bandwidth etc you are using. You can also use it to change your admin settings rather than using the Airport Admin Utility

The Airport Client Utility shows you the current strength/noise of your signal