Windows XP:  Windows XP includes Remote Desktop Web Connection, which is an updated version of the Terminal Services Advanced Client (TSAC). Remote Desktop Web Connection supports Remote Desktop Protocol (RDP) 5.1 and is backward compatible with RDP 5.0.

For more information about using scriptable virtual channels, see Implementing Scriptable Virtual Channels Using Remote Desktop Web Connection.

For more information about virtual channels, see Remote Desktop Services Virtual Channels.

Windows 2000:  Prior to the release of the TSAC as a part of Windows 2000 Server with Service Pack 1 (SP1), implementing virtual channel applications on the client side required developers to create and register a client Dynamic Link Library (DLL). This DLL was loaded into memory on the client computer at the time the Remote Desktop Connection (RDC) client program was run. While this method is still supported, a much simpler and more efficient method exists. Beginning with the TSAC, all client-side virtual channel operations can be scripted, considerably reducing the administrative overhead for deployment.

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Build date: 1/14/2010