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 detectmaxrowcol()   Autodetect the current screen size
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 Declaration
   screen.hdr

 Syntax
   proc detectmaxrowcol extern

 Arguments
   None.

 Return
   None.

 Description
   This routine reads the current video mode and automatically sets the
   system variables __max_row and __max_col to the currently available
   number of screen rows and columns.

   This procedure is automatically called at start-up to adjust the
   contents of __max_row and __max_col according to the current video mode.
   Therefore, you normally need to call this procedure only after changing
   the video mode from within an application.

 Example
   #define EXAMPLE_SCREEN
   #include example.hdr

   proc Test_detectmaxrowcol
   ? __max_row, __max_col        // print current values
   // here run an external program that changes screen mode
   ? __max_row, __max_col        // still print the same values
   detectmaxrowcol()             // detect change in screen dimensions
   ? __max_row, __max_col        // print updated values
   endproc

   proc main
   Test_detectmaxrowcol()
   endproc