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Update (3)
        +--------------------------------------------------------------------+
        |  Operation  | Position |DataBuffer| DataBuff |    Key   |    Key   |
        |             |  Block   |          |  Length  |   Buffer |   Number |
+-------+-------------+----------+----------+----------+----------+----------|
|Expects|  BT_UPDATE  |    X     |  Record  |  RecLen  |          | Key Numb |
|-------+-------------+----------+----------+----------+----------+----------|
|Returns|             |    X     |          |          |     X    |          |
+----------------------------------------------------------------------------+

Replace the record at the current position.




Current Position: Reset if key value is changed.