Connaitre le focus sur l'ensemble du système

function GetSysFocus : integer;
Var
hOtherWin,OtherThreadID,hFocusWin : integer;
Begin
hOtherWin := GetForegroundWindow;
OtherThreadID := GetWindowThreadProcessID( hOtherWin, nil);
If AttachThreadInput( GetCurrentThreadID, OtherThreadID, true ) Then
Begin
hFocusWin := GetFocus;
result := GetFocus;
AttachThreadInput( GetCurrentThreadID, OtherThreadID, False );
End
else
result := getFocus;
End;