Yes. If you have one wireless and one plugged into the USB port ANS2: Yes, A USB host can support up to 127 devices in a "tiered star" formation. You will run out of desk space before you hook up that many USB keyboards.
If you, however want to hook up more, you could hook up some more Bluetooth keyboards, too.
Although USB ports offer a range of advantages over other connection ports on a computer, the truth is that they are far less reliable than the standard PS2 from the 1980s. They are more likely to stop working or work intermittently which is why it is wise to be certain you computer has PS2 ports on its motherboard for both keyboard and mouse connections in case the USB ports stop working. You can use the troubleshooting techniques described above to troubleshoot a non-working keyboard that is attached to a computer with a USB port.
So, startup your computer and look for the LED lights to come on and check to see if your computer’s BIOS is set to halt in keyboard errors. If your USB keyboard passes these tests, you can move on to troubleshooting issues specific to USB keyboards. If you computer has a USB keyboard, it is likely that your mouse also connects to your computer using a USB connection.
Startup your computer and verify that your keyboard does not work after the operating system is finished loading. Now, check to see if the mouse is working. First, if you are using an optical or laser mouse, turn the mouse over and look for a bright red (or maybe blue or green) light is coming out the opening on the bottom of the mouse.
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