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#define INCL_WINHELP
 
HM_SET_ACTIVE_WINDOW
mp1 = MPFROMHWND(hwndActiveWindow);   /* active-window handle      */
mp2 = MPFROMHWND(hwndRelativeWindow); /* application-window handle */
 
An application sends an HM_SET_ACTIVE_WINDOW message to a help window to set
the active and relative windows. The active window is the window to which
the system sends help messages. The relative window is the window next to
which the system displays the help window.
 
Parameter           Description
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hwndActiveWindow    Low and high word of mp1. Identifies the active window.
                    This value can be a window handle or NULL. If this
                    parameter is NULL, the active and relative windows are
                    determined by the system.
 
hwndRelativeWindow  Low and high word of mp2. Identifies the relative
                    window. This value can be a window handle or
                    HWND_PARENT. If the value is HWND_PARENT, the system
                    sets the relative window to be the parent window of the
                    active window.
 
Return Value
 
The return value is FALSE.
 
See Also
 
WinAssociateHelpInstance
 
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