[JamesAB]

Originally Posted by Danny.VBT

You could use a global hook. Even though it is called on every page, you can use a conditional to only execute your code once per visit. You'll probably find a solution using cookies.

Thanks Danny.VBT.

I worked out a cookie solution with the global_start hook, comparing TIMENOW to the time I set in the cookie. If more than an hour has passed since the cookie was set, I run my code.

$recountcookie = COOKIE_PREFIX . 'recount';
$recountcookietime = TIMENOW;

$vbulletin->input->clean_gpc('c', $recountcookie, 'TYPE_INT');

if ($vbulletin->GPC["$recountcookie"] <= ($recountcookietime - 3600))
{
     //Code to do my processing here
     //and then set a new cookie
     vbsetcookie('recount', $recountcookietime);
}

I also started looking at the article [How-To] Extend and use the Session Table Effectively

Which method would use fewer resources on a busy forum, cookies or sessions?

Thanks,
James