Assuming this is a lab you have setup and you actually own all of the computers:
If you are planning to gain access without installing any software on the others, then you could try port scanning to see if any port is open with a vulnerable daemon listening. Try using nmap -sV -p- <ipaddress>
-sV: Probe open ports to determine service/version info
-p- : Scans all ports.
With the results you could go through www.milw0rm.com database to find an appropriate exploit. You could also try the autopwn included in fast-track to try and get answers right away.
But if you are interested in actually learning I highly recommend reading about port scanning to start out with as it is usually a vital process in penetrating a computer.
Here is a place to start: http://en.wikipedia.org/wiki/Portscanning![]()



