A Windows Server 2008 Client Access License (Windows Server CAL) is required for each user or device (or combination of both) that accesses or uses the Windows Server 2008 server software. For detailed information, see the Client Access Licensing page.
Includes five additional Windows Server 2008 Terminal Server (TS) User CALs. User CALs make sense for your organization if multiple employees need access to the corporate network from unknown devices. Device CALs might make economic and administrative sense for your organization if multiple employees access the corporate network from a single device, as in the case with shift workers.