The program illustrated in Figure 19 can be used to update a workstation VSAM sequential data set. If it is run again, new records are added on the end of the data set.
You can rewrite existing records in a sequential data set, provided that the length of the record is not changed. You can use a SEQUENTIAL or KEYED SEQUENTIAL update file to do this. If you use keys, they must be sequential record values from a previous WRITE or READ statement.