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The ACP Enabled thin client system requires three main software components to operate properly. These are the operating system, the communication protocol, and the management software. Each of these components need to be licensed by the appropriate software company.
See Microsoft Terminal Server Licensing for more details.
. ACP Enabled thin clients require either Microsoft's Windows 2000 Server or Windows 2003 Server with Terminal Services enabled to connect to and run a session on. Each of these operating systems require a standard Microsoft Client Access License (CAL) for each connection to the server. These are based on concurrent use; a 5-pack would allow ten users to access server resources, but only five users at a time.
Terminals require an additional Microsoft Terminal Server Client Access License (TS CAL) to connect to terminal servers. This is required regardless if you are using a fat client or a thin client, RDP or ICA. This licensing is per seat; ten terminals would require ten TS CALs, even if only two were connected at a time.
All TS CALs are installed on a Terminal Services Licensing server. This is one machine on the network to act as a repository for all TS CALs. The terminal servers request TS CAL authentication from the Terminal Services Licensing server as terminals attach to terminal servers.
The Terminal Services Licensing server is activated through the Internet by connecting to the Microsoft Certificate Authority and License Clearinghouse. Windows 2000 Server with Terminal Services enabled will issue 90-day temporary licenses while the Terminal Services Licensing server is being setup and activated. If this period has elapsed, the terminal will not connect to the terminal server and will display an "Error Number 50" message box.
Windows 2000/2003 Servers are not normally sold with TS CALs. These need to purchased separately and installed on the Terminal Services License server.
ThinManager has two licensing modes, Standard and Enterprise. Several Terminal Server Group functions and modules require licenses.
Enterprise Licenses provide unlimited connections and are available as Server, Site, and Global versions.
All Enterprise Licenses have built in Redundancy, SmartSession, and MultiSession. See Redundancy, SmartSession, and MultiSession for details.

Enterprise Server License
Enterprise Server includes two license numbers that are installed on two computers to provide redundant ThinManager Servers and unlimited terminal servers and unlimited ThinManager Ready thin clients.

Enterprise Site License
Enterprise Site has a single license number that can be installed on an unlimited number of computers at a single company location to provide redundancy and departmental control. ThinManager Servers using this license will display the licensed company's name and site in the title bar of ThinManager.

Enterprise Global License
Enterprise Global has a single license number that can be installed on an unlimited number of computers at an unlimited number of locations for a single company to provide redundancy, departmental and site control. ThinManager Servers using this license will display the licensed company's name in the title bar of ThinManager.
Standard ThinManager licenses are sold per-connection and are available in 5, 10, and 25-user units. These licenses allow any 5, 10 or 25 ThinManager Ready thin clients to boot and connect to terminal servers and terminal server groups. The licenses are pooled and are released once the terminal is turned off.
Standard Licenses are available as 5, 10, and 25 packs for

Standard ThinManager Licenses
Redundancy requires a set of ThinManager licenses on a second ThinManager Server to allow the ThinManager Ready thin clients to boot if one ThinManager Server fails. Mirrored Licenses also provide redundancy. See Redundancy and Mirrored Licenses for details.

Redundant ThinManager Servers
Updated 7/19/2007