Grey,
Your best bet, is to read the EULA, and see what it states. If you have
Visual Sourcesafe Server, you may have multiple licenses. The piece that
comes with the Visual Studio .Net product is a client version, and I don't
believe that the Professional version comes with the Visual Sourcesafe
plugin.
However, if you have VSS Server, you should be able to run the netsetup to
install on the client pc.
Cheers,
Tim Macaulay, MCSD, MCP.Net
Microsoft Product Support