Help from the Keyboard
Windows provides user access to help information from the keyboard by
notifying the application whenever the user presses the F1 key. The system sends WM_HELP to the window that has the keyboard focus when
the user presses the F1 key. If the window is child window (for example, a control in a dialog box),
function passes the message to the parent window. If a menu is active when F1 is pressed, the system sends the message to the window associated with the
menu. The application responds by displaying help information associated with the
window, control, or menu that has the focus or is active. For example, if the
user selects a control in a dialog box and presses F1, the application displays help information for that control.
parameter of WM_HELP is a pointer to a HELPINFO
structure that contains detailed information about the item for which help is
requested. You use this information to determine the help topic to display.
structure also includes the coordinates of the mouse cursor at the time the
user pressed the F1 key. You can use this information to provide help based on the location of
the mouse cursor.
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