Object index. Basic type.

 Every object has an unique index within a volume. The index is a 32-bit word.
 Together with the volume identity it constitutes the object identity.

 Object index
   0                     is used for the volume object.
   1-2147483647          (bit 31 = 0) are used for user created objects.
   2147483648-4294967295 (bit 31 = 1) are reserved by the system.

See also

• Objid