IOAREA: Keep or Free the I/O Work Area

IOAREA=KEEP: Specifies keeping the CVAF I/O work area. For authorized callers, CVAFFILT returns the address of the kept I/O work area in the CVAFFILT parameter list (CVIOAR). If you specify the same parameter list in subsequent calls, CVAFFILT reuses the same I/O work area.
Tip: If you code this operand, you must subsequently issue CVAFFILT with ACCESS=RLSE to release the I/O work area.
IOAREA=(KEEP,addr or (reg)): Supplies the address of a previously obtained filter save area. See the description of IOAREA=KEEP operand for additional concerns.
IOAREA=NOKEEP: Frees the filter save area upon completion of the CVAF request.
IOAREA=(NOKEEP,addr or (reg)): Frees a previously obtained CVAF I/O work area upon completion of the CVAF request.