Is there a WordPress function displaying all sections registered with add_settings_section()?
I was thinking about SQL query maybe, but have absolutely no idea how and where these are stored, couldn't find them in my database.
This outputs all the sections registered to the page passed in the argument:
Use the core API
A) If you read the Codex about …
… then you'll find the
B) This is the menu page that you registered using …
C) This is used on every admin-UI request. If it wouldn't then stuff like the screen dependend hooks wouldn't work:
Sum up all your pages when registering them: