What is it for?
The first one lights up when Num Lock is pressed, the second one springs into action when Caps Lock is pressed (even when it is accidentally pressed, reminds me of someone who "trained" his assistant to not accidentally go into caps by blu tacking an upside down (sharp side up!) drawing pin onto the caps lock key) but I can't work out what makes the third one light up? 
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Ah, found out what it is! Scroll lock
Oh yeah. And what's a scroll lock when it's at home?
phoenix! Stick to the "need to know thing"! 
and stop asking daffy questions
!
I probably haven't used 40% of the keys on my keyboard 
....simple soul me!
Scroll lock is a new one on me
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