The paper is aimed as a concise and relatively self-contained description of the educational environment TOST, used in teaching and learning Operating Systems basics such as Processes, Multiprogramming, Timesharing, Scheduling strategies, and Memory management. TOST also aids education in some important IT concepts such as Deadlock, Mutual exclusion, and Concurrent processes synchronization. The presented integrated environment allows the students to develop and run programs in two simple programming languages, and at the same time, the data in the main system tables can be monitored. The paper consists of a description of TOST system, the features of the built-in programming languages, and demonstrations of teaching the basic Operating Systems principles. In addition, some of the well-known concurrent processing problems are solved to illustrate TOST usage in parallel programming teaching.
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