Workgroup Security

Is it possible to “hide” other workgroup computers in a Win98/WinXP peer-to-peer environment.

We currently have 2 peer workgroups sharing the same telecommunications and networking resources. We would prefer to not share file/folder resources between peer workgroups.

On the Win98 machines, we have the obvious passwording of shared resources. Am I over looking this feature in WinXP?

We would prefer to only have those machines assigned to each peer able to view the resources of it’s assigned peer.