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Implementation details: * Anonymous users are assigned a unique ID (like `anon42c08f9996194e2a9339`) which gets stored in the django session. `block.scope_ids.user_id` and `block.runtime.anonymous_student_id` will both return this value. * User state for anonymous users is stored in the django cache and automatically expires as the cache gets pruned. Because user state is stored, anonymous users can use interactive blocks like capa problems. * There is no mechanism for upgrading to a registered account and keeping user state since the user state store for anonymous users (EphemeralKeyValueStore) is completely different than the one for registered users (DjangoKeyValueStore/"CSM"), and has no "list all keys" functionality. * "User State Summary" field values are shared among [recently active] anonymous users but are not shared with registered users. * Anonymous users can only access the `public_view` of XBlocks, not the regular `student_view`.
Open edX -------- This is the root package for Open edX. The intent is that all importable code from Open edX will eventually live here, including the code in the lms, cms, and common directories. If you're adding a new Django app, place it in core/djangoapps. If you're adding utilities that require Django, place them in core/djangolib. If you're adding code that defines no Django models or views of its own but is widely useful, put it in core/lib. Note: All new code should be created in this package, and the legacy code will be moved here gradually. For now the code is not structured like this, and hence legacy code will continue to live in a number of different packages.