A vapour lead-through system for a rotary evaporator with a rotatable evaporator vessel and a stationary cooler consists of a vapour lead-through tube and a connection piece. An articulated force structure is provided in the fiber optic plugs to apply a forward force to a ferrule of the fiber optic plug, to dispose the fiber optic plug ferrule in close proximity to an optical interface of the optical receptacle to provide an optical connection therebetween. , a communications network, is provided. A determination is made whether a time difference between a response from a node that is first to complete its task and a response from a node that is last to complete its task exceeds a predefined threshold. Before control is returned to the application software, the sensitive code is again deleted to prevent unauthorized access.