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  1. or download this
    package module_1;
    require Exporter;
    ...
    @EXPORT_OK = qw($A);
    our $A = 100;
    1;
    
  2. or download this
    #/usr/bin/perl
    # script_1.cgi
    ...
    h1("\$A = $A"),
    a( {href=>"script_2.cgi"}, "script_2"),
    end_html;
    
  3. or download this
    #/usr/bin/perl
    # script_2.cgi
    ...
    h1("\$A = $A"),
    a( {href=>"script_1.cgi"} ,"script_1"),
    end_html;