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The RFC refers to streams as Connections. There is a window per Connection.


    The reliability and flow control mechanisms described above require
    that TCPs initialize and maintain certain status information for
    each data stream.  The combination of this information, including
    sockets, sequence numbers, and window sizes, is called a connection.
    Each connection is uniquely specified by a pair of sockets
    identifying its two sides.

  Managing the Window

  The window sent in each segment indicates the range of sequence
  numbers the sender of the window (the data receiver) is currently
  prepared to accept.  There is an assumption that this is related to
  the currently available data buffer space available for this