question: public synchronized TCPConnection openConnection ( ) throws IOException { int id ; do { lastID = ( ++ lastID ) & 0x7FFF ; id = lastID ; if ( orig ) id |= 0x8000 ; } while ( connectionTable . get ( id ) != null ) ; MultiplexConnectionInfo info = new MultiplexConnectionInfo ( id ) ; info . in = new MultiplexInputStream ( this , info , 2048 ) ; info . out = new MultiplexOutputStream ( this , info , 2048 ) ; synchronized ( connectionTable ) { if ( ! alive ) throw new IOException ( "Multiplexer connection dead" ) ; if ( numConnections >= maxConnections ) throw new IOException ( "Cannot exceed " + maxConnections + " simultaneous multiplexed connections" ) ; connectionTable . put ( id , info ) ; ++ numConnections ; } synchronized ( dataOut ) { try { dataOut . writeByte ( OPEN ) ; dataOut . writeShort ( id ) ; dataOut . flush ( ) ; } catch ( IOException e ) { multiplexLog . log ( Log . BRIEF , "exception: " , e ) ; shutDown ( ) ; throw e ; } } return new TCPConnection ( channel , info . in , info . out ) ; }
target:  Initiate a new multiplexed connection through the underlying connection.