So based on your responses I am going to assume the following:
1) you have recently “gained” a network
2) you are unsure of what exactly is on that network
3) you have little knowledge of the security posture of the devices on that network
4) you have permission from the system owners (business?) to add a server to the network and scan the network.
There is two tools that you can download and use to help in your search. The first is called NMAP the second Nessus
NMAP - https://nmap.org/
NESSUS - http://www.tenable.com/products/nessus/select-your-operating-system
You may be able to use NMAP to find the system as it can identify Novell from Microsoft. The idea would be to get the IP address of the system then look at the arp or CAM tables on the switches and figure out what port the IP address is connected to. Then you can follow the cable and get to the system.
Contact me directly and I will send you my email so we can take this off line.
Thank you! I will be using the NMAP tool to find out for sure what we have.