The Cisco Agent Desktop (CAD) and the Cisco Supervisor Desktop (CSD) can be installed with two languages each. The languages are selected during the installation process and can be changed later by running the Postinstall.exe utility. The CAD and the CSD can have different languages installed, as long as they are supported by the Cisco Unified Contact Center Express (UCCX) system. The supported languages are listed in the Cisco Unified Contact Center Express Software and Hardware Compatibility Guide. References: Cisco Unified Contact Center Express Installation and Upgrade Guide, Release 12.5(1) - Install Cisco Agent Desktop, Cisco Unified Contact Center Express Installation and Upgrade Guide, Release 12.5(1) - Install Cisco Supervisor Desktop