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:

> 
> The server "otseeley-remote" is available on your computer. Access the volumes and files locally.
> 
> 
> 

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: 
You may have a stowaway computer on your AirPort network.
Here are a few steps to check this possibilty:

1. activate your AirPort network;
2. open a `Terminal`
3. type `arp -i en1 -a`

Check all the MAC addresses displayed by `arp`. They should all belong to your own Mac, PC, iPhone and Co.. If not, then you have identified a
stowaway computer on your network.

This would mean that your AirPort network is not secured.

Then you can identify which kind of computer this stowaway is by looking at the 3 first digits of its MAC address and locate them within the :
[IEEE OUI official list](http://standards.ieee.org/develop/regauth/oui/oui.txt).

From the described symptoms, this uninvited computer is on the far limit
of your AirPort network. This may be a few hundred meters in outdoor, and about 25 m far in a concrete building.
I turned WiFi on and off and it got rid of the shared computer.