The CS661 Laptop USB (Universal Serial Bus) KVM allows a user to transfer files, control two PCs concurrently, & share peripherals such as a flash drive or hard drive. The ATEN CS661 Laptop USB (Universal Serial Bus) KVM allows the user to set either the desktop computer or the laptop computer as the primary control console. When another computer is connected via a USB (Universal Serial Bus) port, the user can use one set of inputs to control both computers at once. Thanks to CS661s exclusive file transfer feature, a user can also easily transfer files between the two computers. Please note: networking components such as switches, routers, UPS, KVM & wireless devices require that speeds & standards be consistent throughout the network to gain optimum performance. To avoid compatibility clashes or for advice, please contact us on solutions@ebuyer.com.