- All three computers should be in the *SAME* Workgroup, but have individual names.
- In each PC, set at least one folder as "shared" by right clicking it and selecting the Sharing & Security option.
- Configure any third-party software to allow access to the networked computers.
That is essentially it. When you open "My Network Places" in any of the PCs and expand the folder tree, you should see icons for all three PCs together with their "shared" folders.