Expedited information can be sent by an application program in any conversation state except FDX_RESET and PENDING_ALLOCATE.

The APPCCMD CONTROL=SENDEXPD, QUALIFY=DATA macroinstruction is used to send expedited data to a partner LU. The amount of expedited data specified by the application should be in the range of 1 - 86 bytes.

This macroinstruction is posted complete immediately without waiting for a response from a partner LU. This response is not sent by the partner until the expedited data has been received by the partner application.

For more information, refer to z/OS Communications Server: SNA Programmer's LU 6.2 Reference.