The IBM Auxiliary Device Query Reply

The Auxiliary Device Query Reply is used to indicate to the host application the support of an IBM auxiliary device that uses a data stream defined by IBM, refer to IBM 3270 Information Display System Data Stream Programmer's Reference for more details.

When the function is supported, the query reply is transmitted inbound in reply to a Read Partition structured field specifying Query or Query List (QCODE List = X'9E', Equivalent, or All).

When a workstation supports multiple auxiliary devices, the IBM auxiliary devices query reply must be sent for each device.