LA 8,LEN2 Get length of the parameter list.
GETMAIN R,LV=(8) Get storage for the area in which the x
parameter list is to be built.
LR 3,1 Save address of the parameter-list area.
MODCB ACB=ANYACB, x
MACRMF=SEQ,MF=(L,(3),LEN2)
+LEN2 EQU 24
This parameter list is built in the remote area pointed to by register 3. The list is used by VSAM to modify the ACB when an execute form of MODCB is issued (see next example). The list form only creates a parameter list; it does not modify the ACB.