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MIB object instances are modeled by the OI (Object Instance) structure:
               typedef struct object_instance {
                   OID     oi_name;                /* instance OID */
                   OT      oi_type;                /* prototype */
               }               object_instance, *OI;
               #define NULLOI  ((OI) 0)
There are several routines to manipulate MIB instances;
these are described in
smux_util(SLIB).