Question: how to find values of $MAPLE,$TOOLBOX, $VERSION

I did not know about these before. Was looking at

And wanted to display the actual values of $MAPLE,$TOOLBOX, $VERSION,$HOME gives about. 

But everything I tried does not work. 


Where are these things defined and how to display them from inside Maple to see where they point to?


Maple 2020.1 on windows 10


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