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  initwindow                                                            WNDWC
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  Function       Initializes static data for WNDWC routines.  In brief, it
                 sets the defaults for wndwstat, indexes and margins for each
                 video page, and calls qinit.
  Syntax         void initwindow( int wattr, int clearscr, char cursorok );
  Remarks        This is the first routine required to be called early in the
                 main program and only needs to be done once.  wattr is the
                 attribute for the full screen (WINDOW0) for all video pages.
                 If clearscr is 1, then all video pages are cleared with
                 wattr.  Over 50 variables are initialized with this
                 function.  qinit is also called.  See initwindow source code
                 for details.
  Return value   None.
  EOS            Set to (1,1).
  Heap           Allocates virtualstat and pagestat pointers as required.