(1) In OSI, a service primitive issued by a service user to call a function supported by the service provider.
(2) The part of a Web address that follows the protocol and server host name. For example, in the address http://www.server.com/rfoul/sched.htm, the request is /rfoul/sched.html.
(3) In a request/response interaction, the role performed by a business object that instructs a connector to interact with an application or other programmatic entity.
(4) An item that initiates a workflow and the various activities of a workflow.