[MSDN Library June 1998] WM_ACTIVATEAPP (56.2739463601533%)

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

[MSDN Library April 2000] WM_ACTIVATEAPP (56.2739463601533%)

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) (21.2985399192296%)

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