Forces and moments are detected in a distinguishing manner by a simple structure. The terminal comprises detector means that are arranged to detect if there is a contact between at least one surface of the terminal and the skin of the user of the terminal. The client receives a response to the request from a node of the distributed lock manager where the request includes an echo of the local time included in the request. The apparatus is installed in-line with the path of the fluid flow in the system for which the fluid is being used and monitored.