By featuring USB 2.0 DVD Read/Write drives, Zero clients accommodate users who need DVD drives to read files for transfer from one location to another via DVD discs. This option is available in CD9924 and CD7924 models, which feature 6 USB ports and integrated smartcard readers, as well as CD9922 and CD7922 (without integrated smartcard readers). Desktop devices communicate with datacenter backend processing resources over Ethernet network connections and feature PCoIP protocol.