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  1. or download this
    use strict;
  2. or download this
    use CGI qw/:standard/;
  3. or download this
    my @parameter_list = param();
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    my $text = param('textbox_name');
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    my @selection = param('select_list_name');
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    sub show_context {
  if (wantarray()) {
...
    print "Boolean (scalar) context\n";
  }
}