In CGI2.CGI, where are you defining $query? It looks to me as if you cut'n'pasted some code from someone else without a full understanding of what it's doing.

Try either of the following approaches:

• #!/usr/local/bin/perl
  use CGI qw(:all);
  print header;
  print "in cgi2.cgi<BR>";
  $i = param('i');
  print $i;
  [download]

• #!/usr/local/bin/perl
  use CGI;
  $query = CGI->new;
  print $query->header;
  print "in cgi2.cgi<BR>";
  $i = $query->param('i');
  print $i;
  [download]

Update: $CGI -> CGI in the second code example.

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