So now I had passed the hurdle of connecting to the network. I dialed in and found they were set up with a terminal server that would let a caller connect to any computer on their internal network. After a bunch of tries I stumbled across somebody's computer that had a guest account with no password required. Some operating systems, when first installed, direct the user to set up an ID and password, but also provide a guest account. The user is supposed to set his or her own password for the guest account or disable it, but most people don't know about this, or just don't bother. This system was probably just set up and the owner hadn't bothered to disable the guest account.