Shared computer showing up in Finder not part of my network

Hello,
I am very confused on what is going on here. Basically, I am at a friends house and have my MacBook connected directly with an Ethernet chord. There are no other connections going out of the DSL box/Router because there is only one output for internet. It's the generic one that comes with internet installation.
That being said, in the sidebar of my Finder window there is a computer listed under shared called "office" and I am capable of viewing all of the files on this computer.
The only other computer in the house is a Windows 98 Desktop computer, and does not have the same files on it, nor is it even connected to the internet.
Like I said, this is a direct connection, no wireless router.
If it matters, I was previously in town using unsecured wifi from local businesses and then came home, plugged in the ethernet, and the shared computer popped up.
When I disconnect the ethernet, the shared computer goes away.
I am completely boggled on how this can be occuring.

Do you have your MacBook's AirPort turned on? You are likely picking up an unsecured WiFi router and attached computer network.

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