[MSDN Library April 2000] HELPWININFO (54.6202153110048%)

MSDN Library - April 2000 > Platform SDK > User Interface Services > Windows Shell > Shell Reference > Shell Structures

[MSDN Library June 1998] HELPWININFO (50.2281587807904%)

MSDN Library Visual Studio 6.0 > Platform SDK > User Interface Services > Shell and Common Controls > Windows Shell API > Shell Reference > Structures and Enumerations