RPCScan enumerates the RPC endpoint-map elements for port 135. You may differentiate between, for example:
* Windows NT 4.0 SP3 or before and Windows NT 4.0 SP4 or later,
* Windows 2000 SP2 or before and Windows 2000 SP3,
* Default Windows XP and Windows XP SP1,
* Windows XP Home Edition and Windows XP Professional.