Arena records are chained in a doubly linked lists, one for each arena type. That is, the chain chain exists separately for each private arena, the shared arena and system arena.
Special arena records, known as Sentinels head each chain. They describe the entire arena which they head.
All virtual memory is described by by at least one arena record.
Each VMAR is identified by a unique handle referred to as the har.
Arena also records point to the following related memory structures:
Refer to the following for more detailed information