product works as advertised, ready to use. I have three processors connected to a 4-port KVM switch. I had no trouble connecting the video, mouse, and keyboard ports to the KVM hub (contrary to some reviews here). I haven't had any trouble switching either, IF I UNDERSTAND IT. The manufacturer chose the ALT-CNTRL-SHIFT sequence, but don't hold them all at once. Press ALT and release, then press CNTRL and release, and then press SHIFT. The KVM switch then enters scan mode 0, 1, 2, 3 or 4 to select auto scan or one of the four ports. Good product at a good price from AMAZON.
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