# Uses of Package
org.activiti.engine.runtime

- Packages that use org.activiti.engine.runtime
  Package | Description
  --- | ---
  org.activiti.engine | Public API of the Activiti engine. Typical usage of the API starts by the creation of a `ProcessEngineConfiguration` (typically based on a configuration file), from which a `ProcessEngine` can be obtained. Through the services obtained from such a `ProcessEngine`, BPM and workflow operation can be executed: `RepositoryService`: Manages `Deployment`s `RuntimeService`: For starting and searching `ProcessInstance`s `TaskService`: Exposes operations to manage human (standalone) `Task`s, such as claiming, completing and assigning tasks `IdentityService`: Used for managing `User`s, `Group`s and the relations between them `ManagementService`: Exposes engine admin and maintenance operations, which have no relation to the runtime exection of business processes `HistoryService`: Exposes information about ongoing and past process instances. `FormService`: Access to form data and rendered forms for starting new process instances and completing tasks.
  org.activiti.engine.runtime | Classes related to the `RuntimeService`.

- Classes in org.activiti.engine.runtime used by org.activiti.engine
  Class and Description
  Clock This interface provides full access to the clock
  ExecutionQuery Allows programmatic querying of `Execution`s.
  JobQuery Allows programmatic querying of `Job`s.
  NativeExecutionQuery Allows querying of `Execution`s via native (SQL) queries
  NativeProcessInstanceQuery Allows querying of `ProcessInstance`s via native (SQL) queries
  ProcessInstance Represents one execution of a `ProcessDefinition`.
  ProcessInstanceBuilder Helper for starting new ProcessInstance.
  ProcessInstanceQuery Allows programmatic querying of `ProcessInstance`s.

- Classes in org.activiti.engine.runtime used by org.activiti.engine.runtime
  Class and Description
  ClockReader This interface provides clock reading functionality
  Execution Represent a 'path of execution' in a process instance.
  ExecutionQuery Allows programmatic querying of `Execution`s.
  JobQuery Allows programmatic querying of `Job`s.
  ProcessInstance Represents one execution of a `ProcessDefinition`.
  ProcessInstanceBuilder Helper for starting new ProcessInstance.
  ProcessInstanceQuery Allows programmatic querying of `ProcessInstance`s.

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