In the article officers from the General Staff of the Bulgarian Armed Forces present their viewpoint on the issues of simulation systems and their application in training and conduct of computer assisted exercises. A classification of simulation systems is presented in terms of scope and designation. Further, the authors focus on the nature and specifics of the command post computer assisted exercises. The process of their preparation, organization and conduct is set forth, as well as the roles of individual participants. Special attention a devoted to the functional and technological structures, as well as to the information flows during a conduct of a exercise of that type in the Bulgarian Armed Forces.