I have a Belkin OmniView SE 4 port switchbox but I can't seem to get the hot key to work. If I push scroll lock-scroll lock, it beeps and the mouse freezes, but then after a second or two, it just goes back to normal still on the same screen. I've used similar switch boxes at work and usually after hitting the hot key, a menu will pop up and you can choose from available ports. Is the this KVM different? Also, I've noticed that the switchbox works with both the AC adapter plugged in and without. What's the AC adapter for then?