Hello. TRENDnet is a useful little switch to use a monitor, a keyboard, a mouse and a single HP 2 PC but I have a problem with the USB keyboard. Since buying a PS2 / USB adapter I try to use one keyboard for 2 PC, the latest in USB but remains inoperative. I can only use the former in PS2. The adapter vendor (via amazon) contacted responded with some switches (switch) This problem occurs with either the keyboard or the mouse. Personally I have no problem with the USB mouse but only with keyboard (HP Compaq). I had previously tried to contact TRENDNET but the site is in English, a language I do not master without getting an explanation of this problem, which is why I thought of writing this review. Sincerely.