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──Microsoft Foundation Classes──────────────────────────────────────────────
 
  In entries where the term <memberFxn> is used, you must write your own
  member function for a derived CWnd class. You can give these functions
  any name you like. Other functions, such as OnActivate, are member
  functions of the CWnd base class that, if called, pass the message to
  the DefWindowProc Windows function. If you wish to process Windows
  notification messages, you must override the corresponding CWnd function
  in your derived class. Your function should call the overridden function
  in your base class so that the base class(es), and Windows, can operate
  on the message.
 
  In all cases you must put the function prototype in the CWnd-derived
  class header, and you must code the message map entry as shown. See
  Chapter 14 of the <Class Libraries User's Guide> cookbook for message
  map examples.
 
  The term "id" is any user-defined menu item ID (WM_COMMAND messages) or
  control ID (child window notification messages). The terms "message" and
  "wNotifyCode" are the Windows message IDs as defined in WINDOWS.H. The
  term "nMessageVariable" is the name of a variable that contains the
  return value from the RegisterWindowMessage Windows function. It must be
  declared NEAR.
 
 
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