CLI automatically replenishes the response buffers. That is, the database may call DBCHCL for the Fetch function repeatedly. The response buffers may or may not be large enough to hold all the parcels in the response, but the application program can draw on them as if they are.
If the database calls DBCHCL for the Rewind function, the pointer that moves back to the first parcel is a pointer in the response stored on a spool file in the database, not a pointer in the response stored in the response buffers. Therefore, if rewinding may take place, it is important to operate with Keep Response set to 'Y', even if the whole response can fit in the response buffers.