Question: On my MacBook, in the Finder's sidebar there's a machine appearing under "Shared" that I don't recognize and definitely doesn't exist on our local network. When I attempt to connect to it, I get this message:

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> The server "otseeley-remote" is available on your computer. Access the volumes and files locally.
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What is this and how do I get rid of it? I already checked Disk Utility and there are no extraneous volumes mounted or anything.

EDIT:

Additional information based on the questions below:

* There are only two computers on the network, both running Mac OS X - this MacBook, and my PowerBook. The PowerBook shows up in the source list as a separate item from "otseeley-remote"
* There is no Time Capsule on the network, though I do have a Time Machine drive plugged into the PowerBook (not shared, though)
* No VPN
* One wired printer, connected to the MacBook
* Two other wifi networks other than my own appear in the wifi dropdown, so I suppose it's possible that the mystery machine is on a neighbor's network (though why would it show up in my source list?)

EDIT 2:

The mystery computer shows up on both my MacBook's and PowerBook's source list, but not always at the same time. Sometimes it appears on one and not the other; other times, it appears on both.

EDIT 3:

I have two user accounts on the MacBook and both accounts show the "otseeley-remote" item in the Finder. Not sure if that means anything, but just wanted to add another data point.

Answer: 
I've added a possible answer over on SuperUser

<https://superuser.com/questions/268380/mysterious-shared-server-with-same-name-appearing-disappearing/338732>

> 
> Sounds like you might have SMB (Windows) Sharing turned on.
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> To check, go to the System Preferences and click on Sharing. In the list on the left click on 'File Sharing' then there is a little button on the top right called 'options'. In the drop-down that appears check that SMB sharing is un-ticked.
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This may be meaningless to your situation, but I found this article educational -- about how a person's mac has two MAC addresses associated with it (one for its wifi identity and one for its non-wifi, ethernet identity.) One of those "jekyll and hyde" existences is likely the other mystery machine for SOME of the people with this problem -- namely ME.
Take a read through this --
<http://www.macmousecalls.com/files/who_is_invading.html>