How to find correct hook/preprocessor Aside from searching the Drupal api, is there a module or an easy way that will allow you to find out which hook or function you need to use to interact with pages in your site?

For example, I am looking to force certain values in a webform setup, to which I was able to use mymodule_form_webform_configure_form_alter to change the submission limit, status etc. But I was able to do this because I found the starting point for the script, now I am looking to force a default 'email to' value in the setup, but I don't know what function I need to use

What's the best way of finding out the best hook (etc..) for the job

Kind regards
I find the Devel Themer module to be very helpful.

From the description:


  popup display shows which theme function/template outputted the HTML, and what other files could have done so.