The activated state of a window is a frame-window characteristic. The system does not provide an easy way to determine whether a client window is part of the active frame window. That is, the window handle returned by the WinQueryActiveWindow function identifies the active frame window rather than the client window owned by the frame window.

Following are two methods for determining the activated state of a frame window that owns a particular client window:

• Call WinQueryActiveWindow and compare the window handle it returns with the handle of the frame window that contains the client window, as shown in the following code fragment:

      HWND hwndClient;
      BOOL fActivated;
  
      fActivated = (WinQueryWindow(hwndClient, QW_PARENT) ==
                    WinQueryActiveWindow(HWND_DESKTOP));
  
  

• Each time the frame window is activated, the client window receives a WM_ACTIVATE message with the low word of the mp2 equal to TRUE. When the frame window is deactivated, the client window receives a WM_ACTIVATE message with a FALSE activation indicator.