Classes

	Class	Description
	ExternalService	This base class represents an external service inside Revit application.
	ExternalServiceId	Unique identifier of an external service.
	ExternalServiceOptions	Various options affecting the behavior of an External Service
	ExternalServiceRegistry	This class gives access to external services. Use it to register external services with Revit and execute them. Only the application that registers a service is allowed to execute it.
	ExternalServices	Provides a container of all Revit built-in ExternalServiceId instances.
	ExternalServicesBuiltInExternalServices	A collection of ids for external services that are managed and used by Revit directly.
	MultiServerService	This class represents a multi-server service inside Revit application. It is created when an instance of IMultiServerService is registered with Revit.
	SingleServerService	This class represents a single-server service inside Revit application. It is created when an instance of ISingleServerService is registered with Revit.

Interfaces

	Interface	Description
	IExternalData	The base interface for data classes used when executing servers of external services.
	IExternalServer	The base interface for all external servers.
	IExternalService	The base interface class for all external services.
	IMultiServerService	The base interface class for all multi-server services.
	ISingleServerService	The base interface class for all single-server services.

	Enumeration	Description
	DisparityResponse	An enumerated value to return from OnServerDiparity indicating what the service wants Revit to do as the post-action of the call.
	ExecutionPolicy	Controls how servers of multi-server external services are executed.
	ExternalServiceResult	An enumerated value representing a result from executing an external service.
	ServerChangeCause	Indicates the cause for the active server to be changed