//MYJOB JOB(E343),'ABCDEFGH' //JOBLIB DD DSN=ABCD.PROD.LOADLIB,DISP=SHR //STEP1 EXEC PGM=PROG //STEPLIB DD DSN=ABCD.PPROD.LOADLIB,DISP=SHR //STEP2 EXEC PGM=PROG1 //STEPLIB DD DSN=ABCD.TEST.LOADLIB,DISP=SHR ..... ..... In the above code, from which library the loadmodule of PROG1 is executed