Defines the program to be called to handle all SORT and MERGE operations.
>>-.---.--CALLSORT-"sort-name"--------------><
+-/-+
| sort-name | Root-name of a program to be called to process sorts and merges. |
| Default: | CALLSORT"EXTSM" (Dialect ) |
| Phase: | Syntax check |
| $SET: | Initial |