Windows Server 2003 R2 Terminal Server Device Client Access License If you wish to conduct a Windows session, an incremental Terminal Server Client Access License (TS CAL) is required as well. A Windows session is defined as a session during which the server software hosts a graphical user interface on a device. For Windows sessions, a TS CAL is required for each user or device that wants to access that program. This CAL license includes Microsoft's maintenance program Software Assurance For licensing questions contact our Microsoft Certified Professionals at 1-800-474-1045 ext 3. *Price applies to US market only. For Canadian orders contact us for pricing