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push_back (char, [FIFO_or_LIFO])

     Usage: Pushes a character into the keyboard input buffer.  The
            input buffer is 9 characters deep.

Parameters: Char .int. is the ASCII value of the character to be
            pushed. You can get the value from read_char or
            key_to_int (or from an ASCII table). FIFO_or_LIFO .int. is
            non-0 or omitted to use first-in-first-out order, and
            0 for last-in-first-out order.

   Returns: Nothing