I have no idea what this statement means. But if you do indeed have always on USB, that means the ports stay powered regardless of if the machine is on or off so you can use them to charge devices if you want. Maybe they also keep your keyboard lit if you have one of the function lock keys enabled.
Also, before you editted your post said this:
Yes., but my keyboard has never done that before, plus I am sure my keyboard is PS/2.
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