php code file.php?go=

I am new to php and new to google groups...
so go ahead and ridicule me if need be!

I inherited some web pages with php code.
the code is:

href="./index.php?go=about

no problem understanding what the index.php page is all about...
but what is this link about? it does pull up the "about" page...
but where is that file located?
I don't have access to the server - which certainly is a pain,
but I think if I understand more what it points to then I can make it
work.
Is the "about" page a separate php file, htm page, etc.
Thanks.

.

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