Microsoft Windows Server 2003 - License
For PC
The Windows Server 2003 Client Access Licenses (CALs) are available in Per User or Per Device. In Per User or Per Device mode, a separate CAL is required for each user or device that accesses or uses the Windows Server 2003 software on any server. You may reassign a Windows CAL from one device to another device, or from one user to another user, provided the reassignment is made either (a) permanently away from the one device or user or (b) temporarily to accommodate the use of the Window