My undestanding: 

my $a = shift; 1st item
my $b = shift; 2nd item (if exits etc since it was bumped up to top by
+ pervious shift.

my ($a, $b) = @_;

my $a = $query->param('a');
my $b = $query->param('b');

[download]

These are all the same.

In reply to Re^4: CGI Action call by tultalk
in thread CGI Action call by tultalk

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