WinALT – a simulation system for computations with spatial parallelism

A description of user interface and language of a simulation system (WinALT) is given in the article. This system is based upon formal model called Parallel Substitution Algorithm (PSA). The system combines the best features of its ancestors. It has extensible functionality and is open for user modifications and extensions. It has a wide set of tools for visualization and representation of massively parallel distributed in space computations.