What is the AirPort Base Station Agent?

I just noticed in my Login Items on one of two computers (MacPro, no Airport card) there is an Application called AirPort Base Station Agent. It is checked to be invisible on opening. On my laptop (with Airport) that Application is not listed in Login Items. I never put it there myself as I don't know what it's for. It is located in System Folder/Core Services of both computers but only listed as a startup item in one of them.

Can anyone explain? Should it be added to the laptop login?