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The current context is said to be the top element on the stack.
Contextual information is stored in a structure called a ContextNode:

    struct ContextNode {
            struct MinNode  cn_Node;
            LONG            cn_ID;
            LONG            cn_Type;
            LONG            cn_Size; /*  Size of this chunk             */
            LONG            cn_Scan; /*  # of bytes read/written so far */
            /*  There are private fields hiding here.  */

 CurrentChunk()    ParentChunk()