Ok. You know the drill, you need to use the company’s proxy server at work and at home you don’t need a proxy server.(or you use another one)
Well, do you really want to open up IE and go into Tools->Internet Options->Connections->LAN Settings->Proxy Server to change the address or disable/enable it?
(You can actually open Internet Options from Control Panel without opening up IE, but anyway, it still is a long process.)
As everything useful is done in Registry in Windows, we again have some registry scripts.