The Windows XP Professional remote access server capabilities are very similar to those available in Windows 2000 Professional. A Windows XP computer can accept a single incoming connection on each interface that can accept a connection. For example, a Windows XP machine can accept incoming connections on each of the following interfaces:
- Dial-up modem serial interface
- Infrared interface
- Parallel port interface
- VPN interface
While it’s unlikely, a Windows XP Professional machine with the above configuration could conceivably accept up to four simultaneous RAS connections. However, the typical configuration consists of a single RAS client connection, either through a dial-up modem interface or a VPN interface