Its been a long time since I was in the computer game.
If I remember correctly, the default for each PC is to obtain an IP address from a DHCP server which is built into your modem/router.
So if you are connecting the 3 PC's to a switch only you will have to setup a static IP address for each computer (in Network properties) such as 192.168.0.1 etc and a subnet mask of 256.256.256.0.
Then from a DOS prompt you should be able to ping those IP addresses and get a reply that a connection is made.
If successful then Remote Desktop or Teamviewer should be able to transfer files from PC to PC.
I'll ask my son when he comes home, he is still involved in computer service.
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