or download this
<!-- using GET will make the QUERY_STRING as mentioned in the previous
+ post, but.. that's not how it's supposed to be? -->
<form action="minitest.cgi" enctype="multipart/form-data" method="GET"
+>
...
<input type="submit" value="send">
<input type="hidden" name="pregeneratedID" value="123456">
</form>