This paper covers the design and implementation of the
latest Simula based package for discrete event simulation modelling.
Demos inherits Simula's process approach and provides additional features
for handling process synchronisations and interrupts, (unobtrusive) data collection,
automatic tracing and reporting, and for the automatic generation of
well-separated seeds in the random number routines. This paper outlines
the implementation of these facilities and gives examples of how they
can be used.
It is written in five parts: part 1 introduces Simula; part 2 describes
the process approach to discrete event modelling; part 3 compares that
approach with the transaction, event and activity styles and gives
implementation outlines of GPSS, Simscript, and ECSL in Simula; part 4
goes through the facilities contained in Demos and motivates them via
examples; and part 5 is concerned with the implementation techniques
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