[MSDN Library June 1998] BN_DOUBLECLICKED (49.5210727969349%)

MSDN Library Visual Studio 6.0 > Platform SDK > User Interface Services > Controls > Buttons > Button Reference > Button Messages

[MSDN Library April 2000] BN_DOUBLECLICKED (49.5210727969349%)

MSDN Library - April 2000 > Platform SDK > User Interface Services > Windows User Interface > Controls > Buttons > Button Reference > Button Messages