There are three problems designed in the keyboard -- missing indicators

1. NUMBER LOCK ----- 2. CAPS LOCK ----- 3. SCROLL LOCK

I can tell when the cap lock is on --- I can tell when scroll lock is on -- KVM

But not sure how to tell when number lock is on -- no indicator

Num lock makes turns on the numbers on the right on the keyboard, if you can use those numbers then it is on.