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 altkey()            Return the current status of the Alt key
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 Declaration
   io.hdr

 Syntax
   func logical altkey extern

 Arguments
   None.

 Return
   A logical indicating that the Alt key is pressed.

 Description
   The altkey() function returns .t. if one of the Alt keys is pressed when
   the function is called.

 Example
   #define EXAMPLE_IO
   #include example.hdr

   proc Test_altkey
   clear
   cursor( .f. )
   ? "Press the Alt key or Esc to finish"
   do while .not. lastkey() == K_ESC
      inkey()
      if altkey()
         @ 0, 70 ?? "Alt"
      else
         @ 0, 70 ?? "   "
      endif
   enddo
   endproc

   proc main
   Test_altkey()
   endproc