PRODUCT  :  Borland C++                           NUMBER  :  1016
  VERSION  :  3.1
       OS  :  WIN
     DATE  :  October 19, 1993                         PAGE  :  1/2

    TITLE  :  An overview of Object Linking and Embedding





       OLE is an exciting new addition to Windows 3.1.  OLE stands
  for Object Linking and Embedding.  Borland C++ 3.1 supports the
  development of applications that can use the new OLE features of
  Windows.

  The online documentation for BCW has a lengthy description of OLE
  concepts and implementation details.  Search on 'OLE' and take a
  look at the 'OLE function groups', 'OLE functions (3.1)' and 'OLE
  Overview' topics.  The OLE overview is suggested reading for any
  OLE developer.

  Example OLE applications can be found in the following
  directories of Borland C++ v3.1:

      - BORLANDC\EXAMPLES\WIN31\CLIOLE
      - BORLANDC\OWL\EXAMPL31\OLESRVR
      - BORLANDC\OWL\EXAMPL31\OLECLNT

  OLE uses the clipboard and DDE to communicate between OLE
  objects, the OLE objects' servers, and OLE client applications.
  One can use DDE ( or the new DDEML implementation of DDE) to
  handle OLE processing but  it would be wiser to use the OLE API
  interface, in case the internal  DDE details of OLE changes in
  the future.

  OLE clients and OLE servers use a call back function to
  facilitate the communications necessary for OLE.  These call back
  functions are similar to other call back functions, such as the
  familiar window procedures.  Because of implied and expected
  'this' pointer,  a C++ class member function cannot be used as an
  OLE call back function, unless it is a static member function,
  because Windows will not pass a 'this' pointer when calling the
  call back function.

  To see OLE in action run the WRITE.EXE program that ships with
  Windows 3.1.  It is typically found in the Accesories folder.
  Use the Edit|Insert Object menu option to create an OLE object
  that uses Paintbrush as an OLE server.  After drawing something
  in Paintbrush, exit and you should get a dialog box asking if you
  want to embed this object.  Choose Yes.  When Write comes back
  into focus your drawing should appear in the WRITE document.
  This drawing is embedded in Write as an OLE object.  Double click













  PRODUCT  :  Borland C++                           NUMBER  :  1016
  VERSION  :  3.1
       OS  :  WIN
     DATE  :  October 19, 1993                         PAGE  :  2/2

    TITLE  :  An overview of Object Linking and Embedding




  on the image and Paintbrush will run, with your image in the
  editor.

  Notice that Paintbrush will be invoked even if it is not
  currently active on the desktop.  This is one difference between
  OLE from DDE. DDE requires that the DDE server be active on the
  desktop.  OLE objects can invoke their servers if necessary.

  The files BORLANDC\REDIST\OLECLI.DLL and
  BORLANDC\REDIST\OLESVR.DLL are used to implement OLE in Windows.
  The BORLANDC\README file and the nononsense license agreement
  describe the legal issues involved in the redistribution (with
  your applications) of those .DLL's.



  DISCLAIMER: You have the right to use this technical information
  subject to the terms of the No-Nonsense License Statement that
  you received with the Borland product to which this information
  pertains.