position_flag (USHORT) - input
A flag that indicates which data chain element is
specified by the caller:
- Indicates the head element of the chain
- Indicates the tail element of the chain
- Indicates the data element that follows the data
element that is pointed to by the existing_element_ptr input argument
- Indicates the data element that precedes the data
element that is pointed to by the existing_element_ptr input argument
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