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TAB_RESIZE()
   Sets the active region on the SummaGraphics tablet.

   Syntax
         TAB_RESIZE(nLeft,nBottom,nTop,nRight)

   Arguments
         nLeft       Sets the left edge.
         nBottom     Sets the bottom edge.
         nTop        Sets the top edge.
         nRight      Sets the Right edge.

   Returns
         None

   Description
         TAB_RESIZE() sets the active region on the tablet. The active region
         is the area on the tablet where you can position your stylus or
         cursor and have the tablet read the data. The default is to use the
         whole tablet, but using TAB_RESIZE(), you can use only a portion of
         the tablet that you define. The tablet has its own set of
         coordinates, based on its current resolution. The default resolution
         is 500 lines per inch (see your Summagraphics technical reference to
         see how to change the resolution). So, if you have an 18" x 12"
         tablet, your tablet would have a 9000 x 6000 grid. So, if you only
         wanted to use the bottom-left quarter of the tablet you would use the
         command:

            TAB_RESIZE(0,0,4500,3000)

         Where 0,0 is where you want the lower-left corner of the active
         region to be and 4500,3000 is where you want the upper-right corner
         of the active region to be.