Not sure if I understand the node topic with what you show in the node. If you want to remember variable and values you can use Data::Dumper (or a DB, if you really want).
But, a few comments on the code :) First, use CGI.pm for reading in the QUERY_STRING. Second, turn on taint checking, third use strict (which will make you put your variables into scope, which I would also mention).
$r4enc = "$r3enc";
Useless use of quotes in all the lines like the above.
I don't see where $ndcat originates.
You are printing out to an HTML file from a CGI script, and doing no file locking at all. Too many hits at a time and your file will get hosed.
I could go on a little more, but that is enough for now :)
Cheers,
KM
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