GetDC( hWnd )-> <hDC>
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 PARAMETER:

  <hWnd>        Is the handle that identifies the window for that a 
                device context is returned


 RETURNS:

  <hDC>        handle that identifies the device context



 DESCRIPTION:

  This function retrieves the handle of the device context for the client
  area in the given window.
  You may think about a device context as a virtual screen, where <GetDC>
  is similar to clippers DispBegin, and ReleaseDC() is like DispEnd().
  GetDC() starts working with a virtual screen, and  ReleaseDC() updates all
  painting to the visible screen.

  Like with clipper DispBegin() / DispEnd() sequence, if you don't call 
 ReleaseDC() after GetDC(), you are un-balancing windows, causing the
  system to finally to crash.

 SOURCE:

  SOURCE\WINAPI\DC.C