%Config::Config like @Config::ISA lives in package Config; while %Config lives in package main;

When you use Config; it exports %Config into your current package (main). If you use package Huang; use Config; it exports (creates) %Config in package Huang; The fully qualified name of this exported (created) %Config is %Huang::Config;

It is a global variable.

This "exporting" is a copy. Copies take memory. So if you use Config(); or require Config; no copy gets made in your current namespace, but you can still access the original by its full name %Config::Config;

Read Tutorials: Variable Scoping in Perl: the basics, Coping with Scoping

In reply to Re: Config::Config{osname} and Config{osname} by Anonymous Monk
in thread Config::Config{osname} and Config{osname} by PhillipHuang

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