This message allows the application to change the window with which the Help Manager communicates and the window to which the help window is to be positioned.

param1
    HWND   hwndActiveWindow    /*  The handle of the window to be made active. */

param2
    HWND   hwndRelativeWindow  /*  The handle of the window next to which the help window is to be positioned. */

returns
    ULONG  rc                  /*  Return code. */