Since the referencing of the index nodes 55 a c and storage nodes 56 a e is performed indirectly, for instance, by using Equations and , {HEAD ~ the structure} of {TAIL ~ the message store} 50 can be changed dynamically 
Since the referencing of the index nodes 55 a c and storage nodes 56 a e is performed indirectly , for instance , by using Equations and , { HEAD ~ the structure } of { TAIL ~ the message store } 50 can be changed dynamically
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH