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   disp_peekbox

   Usage
   #include <disp.h>
   void  disp_peekbox(unsigned  *save,  unsigned  trow,  unsigned   lcol,
   unsigned brow, unsigned rcol)

   Description
   Stores a rectangular area of the screen defined by top left trow, lcol
   and  bottom  right brow, rcol in the user supplied buffer  save  which
   should  point  to an unsigned integer array large enough to  hold  the
   area being saved. This is calculated as follows:
   size = ((brow-trow+1) * (rcol-lcol+1)) * sizeof(unsigned)

   Example
   #include <conio.h>
   #include <disp.h>

   main()
   {
   unsigned buf[20*5];

        disp_open();
        disp_move(0,0);
        disp_eeop();
        disp_box(0,0x70,0,0,4,19);
        disp_peekbox(buf,0,0,4,19);
        disp_move(0,0);
        disp_eeop();
        disp_puts("hello world");
        disp_flush();
        getch();
        disp_pokebox(buf,0,0,4,19);
        disp_close();
   }