Computer Configuration/Administrative Templates/Windows Components/Terminal Services/Licensing
A license server attempts to provide the most appropriate Client Access License (CAL) for a connection. For example, a license server provides a Windows 2000 TS CAL token for clients connecting to a terminal server running Windows 2000 and a Windows Server 2003 Family Per Device TS CAL token for a connection to a terminal server running Windows Server 2003.
By default, this per-computer setting allows a license server to supply a Windows Server 2003 Family Device TS CAL token, if available, to a terminal server running Windows 2000 if there are no Windows 2000 TS CAL tokens available.
If the status is set to Enabled, when a terminal server running Windows 2000 requests a license, but no Windows 2000 TS CAL token is available, a temporary CAL is issued if the client has not already been issued a temporary CAL. Otherwise, no CAL is issued and the client is refused connection, unless the terminal server is within its grace period.
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