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     For hardware and mode configurations with enough memory to support
     multiple-screen pages, setactivepage specifies the area in memory
     where graphics output is written. The <page> argument selects the
     current active page. The default page number is 0.
 
     Screen animation can be done by alternating the graphics pages
     displayed. Use the setvisualpage function to display a completed
     graphics page while executing graphics statements in another active
     page.
 
     The setactivepage and setvisualpage functions can also be used to
     control text output if you use the text functions gettextcursor,
     settextcursor, outtext, settextposition, gettextposition,
     settextcolor, gettextcolor, settextwindow, and wrapon instead of
     the standard FORTRAN I/O functions.
 
     The CGA hardware configuration has only 16K of RAM available to
     support multiple video pages, and only in the text mode. The EGA
     and VGA configurations may be equipped with up to 256K of RAM for
     multiple video pages in graphics mode.
 
     In OS/2, only page 0 is valid.
 
     Return Value
 
     If successful, the function returns the page number of the previous
     active page. If the function fails, it returns -1.
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