SetCapture( hWnd )-> <hWndPrev>
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 PARAMETER:

  <hWnd>        Is the handle that identifies the window to receive all 
                mouse messages


 RETURNS:

  <hWndPrev> is the handle of the window that previously received all 
  mouse input, or zero, if there is no such window


 DESCRIPTION:

  SetCapture() sets the mouse capture to the specified window. With the 
  mouse capture set to a window, all mouse input is directed to that 
  window, regardless of whether the cursor is over that window.
  Only one window can have the mouse capture at a time. When the window 
  no longer requires all mouse input, the application should call the 
  ReleaseCapture function, to give other windows a chance. 


 SOURCE:

  SOURCE\WINAPI\WMOUSE.C