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Opinions generated from logic (we are programmers, so generally our logic has some merit), economics/social sciences in HS/college, and common sense.

The difference really depends on the extremity...

It's amusing that you come here asking for help, then explain these concepts to us. If you already know the answer, then why ask?
If that's because you don't know how to make the script yourself,...

Not hard at all.

<?php setcookie('splitstart',$_SERVER['SCRIPT_NAME']); ?>
On every of your possible start pages.

On the target page, use:

<?php
///mysql database:
mysql_query('INSET...

Incredibly vague. What are you asking?