DFHZARQ

DFHETC routes SEND, WAIT, CONVERSE, and some RECEIVE commands to DFHZARQ. RECEIVE commands are passed to DFHZARQ if input journaling is in effect. Otherwise, the call is routed to DFHZARL directly.

DFHZARQ passes control to DFHZARM instead of initiating DFHZSDS, DFHZRVS, and so on, if DFHZARQ finds that it is an LU6.2 session. This applies to the SEND, WAIT, RECEIVE, and SIGNAL commands.

Reasons for calling DFHZARQ are:

To avoid duplication of existing code.
So that DFHZCP performs journaling of outbound data.
To perform an implicit CONNECT PROCESS if SEND or CONVERSE is the next session-related command after ALLOCATE.
To enable the SNA change direction (CD) and end bracket (EB) indicators to flow with the data.