Sorry! I should know better than to type example code instead of cut & pasting it. Here is the actual code I was using.........

#!e:/Perl/bin/Perl.exe
use strict;
use diagnostics;
#use CGI qw( :all );
use CGI::Pretty qw(  :all );

my @test_list = qw/the quick brown fox/;
print @test_list, "\n";

print "Have parameters\n" if param;
my @params = param();
print @params. "\n";
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which gives

C:\www\NB.biz\html>menu.pl "a=1&b=2&"
thequickbrownfox
Have parameters
2
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The result is that I now notice I have a "." (dot) after @params in the print line instead of a "," (comma)!

Thanks for your help guys.