The APPC/MVS TP conversation services implement the APPC conversation functions in an MVS-specific way. The APPC/MVS TP conversation services correspond to the SNA models (verbs) described in the SNA Transaction Programmer's Reference Document for LU 6.2. The MVS TP conversation services let you combine many of the APPC conversation functions (Send, Flush, and so on) on a single call. They also support special features of the MVS architecture, such as allowing data buffers to reside in MVS data spaces, and providing asynchronous notification by event control block (ECB) when a service completes.