this product work exactly the way you expect it to work . with Windows 7 on a Dell Vostro , all I have to do be plug in my IBM keyboard and a trackball , then start & restart my computer . so far -lrb- after about 20 start-up -rrb- , the system always find the device immediately -- and do it much more reliably than it do when I be use a two-port adapter to connect a usb keyboard -lrb- w\/trackball -rrb- and a separate keypad .