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| ANSI Common Lisp 21 Streams 21.2 Dictionary of Streams
21.2.42 make-two-way-stream | Function
  Syntax: make-two-way-stream input-stream output-stream two-way-stream Arguments and Values: input-stream - a stream. output-stream - a stream. two-way-stream - a two-way stream. Description: Returns a two-way stream that gets its input from input-stream and sends its output to output-stream. Examples:
       (with-output-to-string (out)
          (with-input-from-string (in "input...")
            (let ((two (make-two-way-stream in out)))
              (format two "output...")
              (setq what-is-read (read two)))))  "output..."
       what-is-read   INPUT...
Exceptional Situations: Should signal an error of type type-error if input-stream is not an input stream. Should signal an error of type type-error if output-stream is not an output stream. Allegro CL Implementation Details: None.

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