## Presentation Device Driver Reference for OS/2

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### Next_Chain_Element Parameter - position_flag

position_flag (USHORT) - input A flag that indicates which data chain element is specified by the caller:

0 Indicates the head element of the chain

1 Indicates the tail element of the chain

2 Indicates the data element that follows the data element that is pointed to by the existing_element_ptr input argument

3 Indicates the data element that precedes the data element that is pointed to by the existing_element_ptr input argument