The present invention concerns a method of network layer load balancing for a server farm that provide identical, transaction and UDP based services, e. The HaRD-OS efficiently and dynamically connects different human operators and algorithms to multiple remotely deployed robots based on the task that the robots are to complete. The second skid rate threshold value is larger than a first skid rate threshold value that is usually employed. The security status determines the security level of operating the computer system. The invention is characterized in that the rod of the piston extends inside the chamber through a projecting lower end providing sealed locking of the intake valve when the head is in low position.