search for tags within a specific forum using tags.php
 

I would like to make a code that searches for a specific tag using tags.php instead of search.php

E.g. this code works with search.php:

tagname

I guess it is possible to use the tags.php for a specific forum only, but how? The reason is that tags.php seems to be updated immidiately while search.php needs to have its index updated - which I think makes a significant difference. Furthermore tags.php seems faster to load - at least first time it has a hit.

Any suggestions ?