Last modified: 2014-10-14 16:44:10 UTC
"Main module", what's that? Never heard of such a thing; mediawiki.org doesn't know either. https://www.mediawiki.org/w/index.php?title=Special%3ASearch&search="main+module" Given the purpose of this page is mainly to provide the (fantastic!) links à la http://deployment.wikimedia.beta.wmflabs.org/w/api.php?action=help&modules=query , I'd replace the header with "Available actions" or even "Index", to give a nudge in the direction of the path most users will be taking. Alternatively, if the aim is to describe the content of the section, it should be something like "generic parameters".
The main module is ApiMain.php, which delegates out to the various submodules via the action= parameter and is the main entry point. It's a bit weird to think of each individual API module as a submodule, but that's how it works internally. This is just the "api-help-main-header" message, so should be easy to fix whenever we come up with an alternative term for it :)
Neither "Available actions" nor "Index" nor "Generic parameters" are really accurate IMO.
