Class                Related Operators             
  broadcast-stream     make-broadcast-stream         
                       broadcast-stream-streams      
  concatenated-stream  make-concatenated-stream      
                       concatenated-stream-streams   
  echo-stream          make-echo-stream              
                       echo-stream-input-stream      
                       echo-stream-output-stream     
  string-stream        make-string-input-stream      
                       with-input-from-string        
                       make-string-output-stream     
                       with-output-to-string         
                       get-output-stream-string      
  synonym-stream       make-synonym-stream           
                       synonym-stream-symbol         
  two-way-stream       make-two-way-stream           
                       two-way-stream-input-stream   
                       two-way-stream-output-stream  

  Figure 21–5: Defined Names related to Specialized Streams