This is the one I have been contentedly using for the past year or so: http://www2.newegg.com/Product/Product.asp?Item=N82E16817107953It's a 4-port PS/2 KVM switch. In addition to using the button on the switch, you can switch systems by hitting Scroll Lock twice, followed by 1, 2, 3, or 4. And, it does beep when you switch.