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Note differences between my() and local();
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my($x); # declares $x to be private to this subroutine
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local($x); # delares $x to be known to this subroutine and all those routines that it invokes
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Typeglob or symbolic reference can be used to pass aruments by reference and not by value
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This has usual advantage that subroutine alters "global" and not a "local" copy -- especially relevant for complex datastructures where you do not want expense of copying
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Scalars are always passed by reference and not by value and by explicitly changing $_[0..], you can affect global scalars
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