> 
> My brain does not process icons well. I still find it a 50-50 proposition
> selecting between O and I when I want to power on new computer 
> equipment - I
> have no idea if O means On or empty or Off or what.

Those are not O & I, they are 0 (zero ) and 1 (one).
zero = off, 1 = on. Very easy.
JCO

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