Queues for half-duplex conversations

There are four conversation queues associated with a half-duplex conversation:

SEND/RECEIVE queue
EXPEDITED SEND queue
EXPEDITED RECEIVE queue
TESTSTAT queue

VTAM® allows macroinstructions to be outstanding on all four queues simultaneously.

The SEND/RECEIVE queue is used to store macroinstructions that either send or receive normal information. The following macroinstructions are stored on the SEND/RECEIVE queue when issued by the application program:

APPCCMD CONTROL=SEND, QUALIFY=CONFIRM|CONFIRMD| DATA|DATACON|DATAFLU|ERROR|FLUSH
APPCCMD CONTROL=PREPRCV
APPCCMD CONTROL=SENDRCV
APPCCMD CONTROL=RECEIVE
APPCCMD CONTROL=DEALLOC
APPCCMD CONTROL=DEALLOCQ
APPCCMD CONTROL=REJECT, QUALIFY=CONV
APPCCMD CONTROL=RESETRCV
APPCCMD CONTROL=SENDFMH5

The APPCCMD CONTROL=RECEIVE, QUALIFY=ANY|IANY macroinstructions are placed on the queue when they are matched to information for the conversation.

The EXPEDITED SEND queue is used to store macroinstructions that send expedited information. The following macroinstructions are stored on the EXPEDITED SEND queue when issued by the application program:

APPCCMD CONTROL=SEND, QUALIFY=RQSEND
APPCCMD CONTROL=SENDEXPD, QUALIFY=DATA

The EXPEDITED RECEIVE queue is used to store macroinstructions that receive expedited information. The following macroinstructions are stored on the EXPEDITED RECEIVE queue when issued by the application program:

APPCCMD CONTROL=RCVEXPD, QUALIFY=ANY|IANY
APPCCMD CONTROL=RCVEXPD, QUALIFY=SPEC|ISPEC

The APPCCMD CONTROL=RCVEXPD, QUALIFY=ANY|IANY macroinstructions are placed on the queue when they are matched to information for the conversation.

The TESTSTAT queue is used to store macroinstructions that query the conversation. The following macroinstructions are stored on the TESTSTAT queue when issued by the application program:

APPCCMD CONTROL=TESTSTAT, QUALIFY=SPEC
APPCCMD CONTROL=TESTSTAT, QUALIFY=ISPEC

The APPCCMD CONTROL=TESTSTAT, QUALIFY=ALL|IALL macroinstructions are not placed on the queue because they pertain to all conversations for an application rather than being specific to a particular conversation.