CCA Release 2.54
In each procedure call, a segmenting-control keyword indicates whether the call
contains the first, middle, or last unit of segmented data; the chaining_vector
parameter specifies the work area that the verb uses. (The default
segmenting-control keyword ONLY specifies that segmenting is not used.)
6-4 IBM 4758 CCA Basic Services, Release 2.54, February 2005