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 <FORM ACTION="http://....etc/upload.cgi" METHOD="post"  
 ENCTYPE="multipart/form-data">
...
 Your email address: <INPUT TYPE=text" NAME="email_address";
 <INPUT TYPE="submit" NAME="Submit" VALUE="Submit Form">
 </FORM>

 use CGI;
open (TEST, ">data_file");
...
</head>  other stuff
 </html>
end_TEST