Systems, methods, apparatus and software can be implemented to provide a debugger agent, either separate form or integrated into the script-based testing platform, to coordinate the selection, activation, and oroperation of debuggers suitable for a particular unit and program under test. In one aspect, the system includes a plasmatron configured for low flow operation followed by a reaction extension cylinder and then by a nozzle section capable of providing additional air andor fuel inputs. The tray reciprocates between a retracted position and a projected position. The multimedia processing device then calculates the security key by a one-way operation based on the personal key of the multimedia processing device and the entity identifier. The opening of the inner formwork corresponds to the size of the recess to be formed on a concrete body.