but what are you trying to do?
Remember an ANCHOR will lead to a specific part of an HTML document where as a LINK will lead to a document on the web ( or for argument's sake.. within a site)
There in lies the difference between: #, #anchor, page.php, and page.php#anchor.
the first is generally a placeholder... really lending nowhere,
the second will take you to the document: page.php
the third will go to the element with the ID of "anchor" in THAT SAME DOCUMENT.
and the last will take you to the element with the ID of "anchor" in the DOCUMENT named page.php.
if you are doing a site navigation going from page to page you really don't need the anchor. if you are navigating within the same page, you really don't need the document name/ path
hope that helps