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 iskey()             Return if a key press is available
------------------------------------------------------------------------------
 Declaration
   io.hdr

 Syntax
   func uint iskey extern

 Arguments
   None.

 Return
   The code of the first available keypress.

 Description
   The iskey() function returns 0 if no key is available or the key value if
   a key is available, leaving the key in the keyboard buffer. Key values
   are defined within the key.hdr header file.

 Example
   #define EXAMPLE_IO
   #include example.hdr

   proc Test_iskey
   ? "Press any key to abort..."
   do while iskey() == 0         // wait for a key to be pressed
      // do processing here
   enddo
   endproc

   proc main
   Test_iskey()
   endproc