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Unfortunately, this switch has a dedicated port for keyboard that listens for the keyboard keystroke. You MUST plug the keyboard into the dedicated keyboard port on the KVM switch for the hotkeys to work. I recommend putting the mouse that comes with your keyboard to the side, and using another mouse, plugged into the dedicated mouse USB port on the switch. Not the prettiest solution, but some of those mouse/keyboard combos have some funky hardware!
Make sure your keyboard and mouse are plugged into the right USB ports on the switch. If you plug the keyboard into the mouse USB port the hotkeys will not work! The USB ports on the KVM switch are labeled under each port, with a mouse and keyboard icon respectively.From the Quick Start Guide/Manual:
The Numlock hotkeys are listed as:
[Num Lock]+[-] 
Switches to output 1
[Num Lock]+[-] 
Switches to output 2
Auto-scans and chooses which ever port is connected.
Alternatively: Tap [Scroll Lock] twice to automatically switch between ports.
Note: I've never been able to get the Numlock key combinations to work correctly. I always just use double-tap [Scroll Lock] trick to switch.
If you get stuck with your scroll-lock and Alpha lock lights flashing, just hit [Esc] to fix it.
(Scroll down to "Quick Start Guide" and choose CS62U out of the drop down).
The GCS634U is designed and tested to work only with a standard USB keyboard and mouse. However, most wireless keyboards and mice work with it, but they cannot guarantee any specific model or brand that would work correctly.
As you can see, this KVM switch is a bus powered device (meaning it only gets power from the USB ports of the computers). If the computer cannot provide enough power for the KVM switch to function correctly, then the wireless keyboard will be affected.
You may try using the IOGEAR GKM541RA. It's tested to work with the GCS634U. Or you may also try using a self-powered USB hub (meaning, it has it's own power adapter) and connect it in between the KVM switch and the computer. That self-powered USB hub will be the one that will add up power to the KVM switch and help it to function properly.
if you tried to connect your mouse to the keyboard port and still it doesn't work. Power cycle meaning unplug the KVM from the CPU, monitor, keyboard and mouse. Then wait for about 30seconds before reconnecting again. If you still encounter the same problem that the keyboard port won't work then it means that keyboard port is defective. Replace it.
The MS keyboard & mouse receiver is effectively a USB hub with two devices connected to it. So, plugging it into the keyboard socket on the KVM switch may well work, depending on how that particular switch implements USB. If it just passes things through, it should be OK. On the PC side you should only need to plug in the USB cable from the switch's keyboard port.
I occasionally have a similar problem with a couple of my KVM?s and I think it relates to the circuitry in the KVM that is supposed to fool the PC into thinking a mouse/keyboard is attached. Windows doesn?t see the mouse so it doesn?t load the drivers unless you force it.
What works for me is to just start the PC and switch the KVM to that PCs port and leave it there till the computer finishes booting. Then its safe to switch to the other port, probably not the elegant solution you were looking for but it works every time.
Are you sure, the usb cable belonging to the keyboard is plugged in the appropriate slot?
I have a wireless keyboard/mouse, so I have only 1 usb cable going into the switch. The first time, is plugged it into the slot of the mouse, and the switch did not work, so I plugged the cable in the other slot, and now everything works properly.