Can I use another CVS, like ClearCase or VSS?
Yes. ClearCase plug-in for Microsoft Visual Studio was designed primarily for use with MS Visual Studio, but in principle it can be used with any IDE that supports Microsoft’s SCC API. Magic C++ Advanced Enterprise Edition 4.0 has implementated Microsoft SCC API, so any source control plug-in for Microsoft Visual Studio include ClearCase, VSS etc. can be reused in Magic C++ without any modifications.