class CSubSessionIx This sub-session container will maintain its own array of TEntry cells in memory as arrays provide for quick access in some situations. There will be two types of cells in the array; cells carrying pointers to sub-sessions and a virtual list of free cells. This layout means that with a handle, the entry holding the sub-session can be looked up in the container directly and if needing to insert a new entry the first free cell is indicated by iFreeListHead. The array will grow with EIndexGranularity each time it runs out of free entries. However, it maintains a high watermark and will never shrink. The handles are defined by TSubSessionHandle, which in the current architectures is a 32 bit word, constructed as needed. It is simple to deduct from the context so there is no need to store it.

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