Looking up a record by key field

     I have been programming in COBOL in a VAX / VMS environment for a few 
years and have discovered that the AS/400 COBOL syntax and environment are 
significantly different from what I had been used to.  Can anyone tell me 
what the ILE COBOL400 statements are to:

1.  Select a master file (with patient-number as the key) to be read 
sequentially.

2.  Select a supplemental patient data file (also with patient-number as 
the key) in which I want to look up the corresponding patient number from 
the master file.

3.  Read the supplemental data file by key field (patient number).

     In other words, I need to read each record of the master file 
sequentially, look up the corresponding supplemental patient data in the 
supplemental file (by patient number) if a supplemental record for the 
patient exists, edit data in the fields of the supplemental record (if it 
exists), then re-write the supplemental record.

Any assistance would be GREATLY appreciated.


Dan Taylor
     Erie County Department of Health
     dtaylor@ecdh.org


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