Bitrix Kernel (main module)

When to use

• The user needs kernel bootstrap services in Bitrix — Application::getInstance(), the Context, the Request, the connection pool, or the service locator.
• The user wants to register or handle a Bitrix event — the D7 EventManager/addEventHandler or the legacy RegisterModuleDependences.
• The user needs to include a Bitrix module or connect code to the kernel — Loader::includeModule() (D7) or the legacy CModule::IncludeModule().
• The user reads HTTP input in Bitrix and asks whether to use the D7 Context::getRequest() accessors or the legacy $_REQUEST/$_GET superglobals.

When NOT to use