The Airport Hangup Utility is a tiny utility that disconnects the Airport Base Station
modem from its dial-up connection. It's pretty self explanatory - just one button(!) 
that instructs the base station whose IP address is shown to hang up its modem. For 
most users, the default IP address, 10.0.1.1, should work fine. If not, you may have to
use the "Discover Devices" button on the Java-based Airport Base Station Configurator
(http://gicl.mcs.drexel.edu/sevy/airport) to determine the address of the base station.