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Important: The information in this document is obsolete and should not be used for new development.

Inside Macintosh: Networking With Open Transport / Part 2 - Open Transport Reference: Chapter 22 - Endpoints Reference / Functions

Functions for Connectionless Transaction-Based Endpoints
You can use a connectionless transaction-based endpoint to transfer data after the endpoint is bound and while it is in the T_IDLE state. Connectionless transaction-based service used by protocols such as ATP is described at greater length in the section "Using Connectionless Transaction-Based Service".
This section describes the routines used to send and retrieve requests and replies: OTSndURequest, OTRcvURequest, OTSndUReply, and OTRcvUReply. This section also describes the OTCancelURequest function, which you use to cancel an outgoing request, and the OTCancelUReply function, which you use to cancel an incoming request.