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. 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