Yes, the "reverse" script name its not enough correct name.
What I mean, is advanced technique based on deep knowledges of Perl and understanding it features. That's not just "flat" solution. I mean, that I input in web-browser window url or IP address of target web server, slash, then goes long code(script source), then we execute it on the fly, and get various server info. This possible, this can be done, this works.