The standardization of simulation protocols through the SIMulator NETworking (SIMNET) and Distributed Interactive Simulation (DIS) concepts has allowed the interconnection of dissimilar simulators into an electronic battlefield. A distributed simulation may encompass many different types of systems and the number of entities in an exercise can grow to thousands. As the network traffic increases, an exercise control and management system is critical in order to successfully control the scenario. In DIS, a host computer designated as the Simulation Manager (SM) performs exercise management functions via 12 SImulation MANagement (SIMAN) PDUs. Some functions performed by the SM include: Start, Restart, Maintenance, and Shutdown of an exercise. The focus of this paper is to describe an on-going design and development effort which will result in the test, validation and implementation of the 12 new SIMAN PDUs on a workstation. From this workstation, a DIS exercise manager will be able to utilize the SM software to control all of the entities (live, constructive and virtual) on the battlefield.