Intruder on the net

in Finder, on shared, there are a couple of unknown computers or servers, is it that they are sneeking in my network or computer? how can I stop that?
Thanx!

Those items are simply devices on your local network that are advertising their services, so your machine shows them there.  What they are we can't say without more information.  Could be a computer that you could share files with, could be a printer, could be an iPad/iPhone/iPod, could be something else.  Their presence there is not an indication that they are trying to connect to you.
If there shouldn't be any other devices on your wireless network, and it's not protected with a password, then you may have freeloaders using it.  Freeloaders who could, potentially, snoop on your network traffic.  Lock the network down with WPA encryption ASAP.

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