What function in vB 3.7.0 can I hack right before the page is output?

[StephenKay]

I recently upgraded an old 2.3.0 board to the latest 3.7.0.

I am now trying to recreate some of my old hacks.

In the old code, there was a function named dooutput(...) (in admin/functions.php) that essentially was the last thing called before the php-prepared HTML was spit out to the browser page. I was using a hack inside this function to parse the finished HTML and substitute some words for other words for a specific purpose.

Can anyone tell me where the corresponding function would be in 3.7? I'm not having much success in finding it, everything is so different now....