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 set alternate       Control the alternate flag
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 Syntax
   set alternate on|off

 Arguments
   None.

 Description
   The set alternate command controls the alternate flag. The default
   alternate flag setting is off.

   If on is specified and the alternate file is open, then screen I/O is
   duplicated to the alternate file. If off is specified, then screen I/O
   is not duplicated to the alternate file.

 Example
   #define EXAMPLE_FILE
   #include example.hdr

   proc Test_setalternate
   set alternate to "test.txt"
   ? "Text 1 will not be in the alternate file."
   set alternate on
   ? "Text 2 will be in the alternate file."
   ?
   @ row(), 0 say "Text 3 will not be in the alternate file."
   close alternate           // turn off and closes the alternate file
   ? "Text 4 will not be in the alternate file."
   ? ; ? "Contents of the alternate file"
   type "test.txt"
   erase "test.txt"
   endproc

   proc main
   Test_setalternate()
   endproc