Forumlar / Cotonti / Development / Anket: modules and plugs

RSS and Search in their current form would be plugins since they extend upon existing functionality (namely pages). If they would be modified to be more generic (and provide an API for example), they could be classified as modules.

Polls is a tricky one, but I'd classify it as a module since it provides new functionality and doesn't strictly rely on existing features (of course for forum polls it does, but that would be a plugin inside a module, actually I'd split these two into separate extensions).

The way the extension is displayed (either fullscreen or as a component) is only a rough guideline and doesn't work in all cases. The main factor should be whether the extension introduces stand-alone functionality without relying on other modules.