If you specify REXXIN(YES), the system allocates and names your REXXIN input data set using the following REXX check definition information:

1. REXXHLQ(hlq )
2. EXEC(execname)
3. REXXIN(YES)
4. ENTRYCODE(entrycode)

For example, let's say a non-TSO REXX check is defined with the following parameters:

EXEC(HZSSXCHK)
REXXHLQ(IBMUSER)
REXXIN(YES) 
ENTRYCODE(1)    

The REXXIN data set name that the system uses is IBMUSER.HZSSXCHK.REXXIN.E1. If you did not define an entry code for this REXX check, the REXXIN data set name would be IBMUSER.HZSSXCHK.REXXIN