The purpose of a StreamManager object is to maintain lists of an application's
StreamExporter and Stream objects. The necessary methods are defined in the
mmstream.stream.StreamManager interface. Besides, the interface comprises an overloaded
importStream() method, which is intended to create new Stream objects and
register them with the StreamExporter object specified as an argument to the method.
The mmstream.stream package provides TOMS_StreamManager class, which implements the
StreamManager interface in a straightforward way.