[MSDN Library June 1998] WM_ACTIVATEAPP (30.1012145748988%)

MSDN Library Visual Studio 6.0 > Platform SDK > User Interface Services > Windowing > Windows > Window Reference > Window Messages

[MSDN Library April 2000] WM_ACTIVATEAPP (30.1012145748988%)

MSDN Library - April 2000 > Platform SDK > User Interface Services > Windows User Interface > Windowing > Windows > Window Reference > Window Messages

[MSDN Library June 1998] WM_ACTIVATEAPP Has lParam of Zero (0) (19.7867199182989%)

MSDN Library Visual Studio 6.0 > Knowledge Base > Win32 Software Development Kit