Control up to 4 pc or mac computers from a single keyboard mouse and monitor and share any usb device between all connected computersr r integrated usb 20 hub allows the user to share usb peripherals eliminating the expense of duplicate devicesr rugged solid steel rack mountable case offers durability even in harsh environmentsr absolutely no software or drivers required providing a completely os independent kvm solutionr r the sv431usb 4 port rack mountable vga usb kvm switch with hub offer