Originally Posted by chuckhole
You must allow two levels of permissions: Share and File. To allow Share permissions, you will need to add the Everyone group Full Control. This way, the Share will not be restricted. This means that you can connect to the share. It does not mean that you can access files.
Second, you must set security for the files and folders within the share location. Right-click on the root folder of the Share and select Properties and then Security. To add a user or group to the permissions, you will need to add them with the full domain\user contect. The domain name is the computer name of the other computers you want to add. So on computer AAA, if you want the add the Users group on SSS, you would add SSS\Users to the file/folder security and give it the ability to Read or Change files. The permissions should be set to Inherit to all of the subfolders.
This same action needs to be performed on each machine in your Workgroup.
Note that these actions must be performed by an Administrator level user on each computer.