Detect if add on is installed

[Daniel Hood]

What's the best way to detect if an add on is installed (and active)? I know I could do so with a query but if it's accessible with a cached variable already I'd rather do that.

 

[Jeremy]

http://xenforo.com/community/threads/1-2-beta-tips-tricks-faq.52836/#post-565939

 

[Daniel Hood]

Perfect. Thanks.