Last week, at this time, I was having major problems with my laptop. Sometime around 6pm on Sunday, my MacBook Pro suddenly decided it could not use DHCP anymore. (DHCP, for the uninitiated, is the ability for your computer to just work when you join a network. If you don't have DHCP, you have to know a valid IP address, the gateway IP address, and IP addresses of working DNS servers to connect to the same network. DHCP just asks the router to give this to you automatically.) So, upon realizing it was my computer only, I tried testing it at the neighbor's house (because our Internet con