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In a URL, a hash mark, number sign, or pound sign ( # ) points a browser to a specific spot in a page or website. It is used to separate the URI of an object from a fragment identifier. When you use a URL with a # , it doesn't always go to the correct part of the page or website.
AnchorQuery™ is a specialized pharmacophore search technology that brings interactive virtual screening of novel protein-protein inhibitors to the desktop.
URL parameter is a way to pass information about a click through its URL. You can insert URL parameters into your URLs so that your URLs track information about a click. URL parameters are made of a key and a value separated by an equals sign (=) and joined by an ampersand (&).
?var=var#hash
Everything after # is client side.
Also, look into URL rewriting to get rid of ugly ?var=var.
? should come before the # as noted in RFC 3986:
relative-ref = relative-part [ "?" query ] [ "#" fragment ]
Taken from an answer over at Super User (Does an anchor tag come before the query string or after?):
Note that when the URL has both anchor tags (#) and query strings (?), the browser may ignore the query string and navigate to the anchor tag without reloading the page.
It may be necessary to submit the page using a
<form action='webpage.php?q=string#tag' method='GET or POST'>
<input type='text' id='q' name='q' value='string'>
<input type='submit' value='submit'>
</form>
rather than just a URL link
<a href='webpage.php?q=string#tag'>.
If the intention of using # is to denote a page fragment then - yes ? and then #.
If # is coming before ? and it is not to denote a page fragment (this can happen when # is part of authority (username and password)) it has to be encoded or you are in trouble. The same applies to any other special characters (:,@,...) that could give a different meaning to the URL.
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