My problem is not to learn how to achieve an alias but to understand the behavour of the script supplied.

:) I get that, didn't my DDumpering explain anything, or did it only raise more questions?

Related links Unknown entries in %main::, What is %:: used for?, keys %::, Tutorials: Of Symbol Tables and Globs, perldata#Typeglobs and Filehandles

Its just I call it magic, it is officially called "magic" , see http://search.cpan.org/dist/illguts/index.html

:) sorry (: