The host computer and one of the computers "see" each other just fine via ethernet cables. I can exchange data through the "shared docs" folders from both. I just connected a third computer via an ethernet cable, and it’s connecting to the internet just fine from the host, but I can’t "see" the shared docs folders on the other two computers from the third computer, or see the third computer from the others. What am I forgetting to do? Thanks!

Make sure the "workgroup" name is the same on all machines and enable network discovery and file sharing on all the machines and it’s better to have them all use the same router… You can also share printers, scanners, etc…

GOOD LUCK !!!