Below are very "concise" guidelines for how to use "streams"
in Csim in order to assure that the pseudo-random number streams 
generated for different purposes in a simulation (e.g., service times
versus interarrival times) are as independent and non-interacting
as possible.

Step 1:  Declare the streams.  E.g.
  
    STREAM arrival_strm;
    STREAM service_strm;

    STREAM is a new data type to represent a separate random stream.
    It is actually a typedef to 'struct strm *', i.e. a pointer
    to an internal stream structure to track the next seed value
    to be used in the generation.  

Step 2: Initialize the streams.  E.g.

    arrival_strm = stream_init (1L);
    service_strm = stream_init (3L);

    The function stream_init initializes a stream to an initial seed
    value (of type long) via the argument and returns a stream handle.

Step 3: Calling the desired functions to generate the variates.  E.g.
   
    stream_expntl (arrival_strm, IATM);
    stream_random (service_strm, MIN_ST, MAX_ST);

    The new functions mirror their non-stream counterparts.  The calling
    convention is to prefix the old function with stream_ and to supply 
    the stream identifier in the first argument.

    Stream variants are supported for at least the following distributions:
          stream_uniform
          stream_expntl
          stream_erlang
          stream_hyperx