[MSDN Library June 1998] WM_ACTIVATE (44.1570881226054%)
MSDN Library Visual Studio 6.0 > Platform SDK > User Interface Services > User Input > Keyboard Input > Keyboard Input Reference > Keyboard Input Messages
[MSDN Library April 2000] WM_ACTIVATE (44.1570881226054%)
MSDN Library - April 2000 > Platform SDK > User Interface Services > Windows User Interface > User Input > Keyboard Input > Keyboard Input Reference > Keyboard Input Messages