Using APPC Verbs

Communication between two transaction programs is accomplished using APPC verbs. These verbs fall into three categories:

• Management verbs, which establish APPC LU 6.2 session limits and obtain configuration information and current operating values for the SNA node. The management verbs are CNOS (Change Number of Sessions) and DISPLAY.
• Transaction program (TP) verbs, which initiate and terminate TP sessions. The TP verbs are GET_TP_PROPERTIES, SET_TP_PROPERTIES, TP_ENDED, and TP_STARTED.
• Conversation verbs, which enable TPs to allocate and deallocate a conversation, send and receive data, and change conversation states. Conversation verbs fall into two groups: mapped and basic.