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There is the need for you to set up your workgroup name so as to put users that have the same purpose together in the same group. Take for example you can create a group for those in the accounting department so that their functions are only limited to those in that department. This will make those information and data to be more secured. It will also prevent those that are not members of that department from having access to their data.
The information displayed below showed how you can set up workgroup name in Windows 7. Enjoy.