Examples of the WRITER parameter

//MYOUT  JOB    ACCT928,MAEBIRD,MSGCLASS=B
// START XWTR
//MYDS   OUTPUT WRITER=MYPGM
//STEP1  EXEC   PGM=REPORT
//RPT1   DD     SYSOUT=A,OUTPUT=*.MYDS

The second statement is a JCL command statement to start the IBM-supplied external writer. This writer is a cataloged procedure in SYS1.PROCLIB. The sysout DD statement RPT1 explicitly references OUTPUT JCL statement MYDS, which specifies that the program MYPGM is to be loaded by XWTR and process the sysout data set.

//**START XWTR
//MYOUT  JOB    ACCT928,MAEBIRD,MSGCLASS=B
//MYDS   OUTPUT WRITER=MYPGM
//STEP1  EXEC   PGM=REPORT
//RPT1   DD     SYSOUT=A,OUTPUT=*.MYDS