I am not sure I understand your question, it is a bit unclear.
When forum.php is executed it loads template FORUMHOME. So you could place an anchor in "FORUMHOME right above the footer template variable. You could also place your anchor in the "footer template" directly, thus making it available on all pages.
Not sure if this is what you are looking for.
Code:
<a href="#footer"></a>
{vb:raw footer} <!-- footer template variable -->