From: ted.dunning@gmail.com   
      
   This really depends on what kind of data streams you mean.   
      
   Some possibilities that you might have meant include:   
      
   a) sequences of floating point numbers representing analog signals.   
   These data streams must generally be specifically constructed to match   
   what you are looking to work with but construncting these is pretty   
   easy (usually).  For instance, if you want Gaussian noise with   
   particular spectral properties, you can use a tool like Matlab or   
   Octave or even a general purpose programming language.   
      
   b) sequences of random characters with defined short-range statistical   
   structure defined by example.  See emacs dissociated press mode.  More   
   particularly, just write a simple program to emulate this by taking   
   your example file and seeking to random locations with the correct   
   history and off you go.  Some indexing will give you the speed you   
   need.   
      
   c) sequences of structures according to some syntactic definition.  If   
   you just want to generate these and don't care about the specific   
   distribution, then this is easy ... just define programming structures   
   whose possible inter-relations reflect the possible syntactic relations   
   and then dump them to strings to get your sequences.  If you need a   
   specific distribution, this can be much harder.   
      
   d) ???  There are literally an infinite number of things that you might   
   have meant, any one of which may or may not have a simple answer.  Can   
   you say more specifically what you were talking about?   
      
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