IBM SC33-1683-02 - Manual (Page 256)

The command-level parameter structure
The command-level parameter structure consists of a series of addresses. The first
address points to the EXEC interface descriptor (EID), which consists of an 8-byte
area that describes the type of request and identifies each keyword specified with
the request. The remaining addresses point to pieces of data associated with the
request. (For example, the second address points to the queue name.)
You can examine the EID to determine the type of request and the keywords
specified. You can examine the other parameters in the list to determine the values
of the keywords. You can also modify values of keywords specified on the request.
(For example, you could change the sysid specified in the request.)
X'02' WRITEQ X'80' QUEUE X'01' SET
X'04' READQ X'40' FROM|SET|INTO
X'06' DELETEQ X'20' LENGTH
X'10' X'40' WRITEQ
X'08' X'80' READQ
X'04' X'C0' READQ(nosuspend)
X'02' SYSID X'04' DELETEQ
X'01'
08 .. .. 00 08 .. 00 .. 00
Addr0
Addr1 queue name char(4)
Addr2
set address or data fullword/char(*)
Addr3
Addr4 data length halfword
Addr5 dummy args
Addr6
Addr7 system id char(4)
Figure 3. The command-level parameter structure for transient data
transient data EXEC interface program exits
224 CICS TS for OS/390: CICS Customization Guide