1. A method for communication between a client and a server in a client/server system using an OPC UA protocol, comprising: making a OPC UA service call for interaction between an OPC UA client and an OPC UA server; and carrying out communications between the OPC UA client and the OPC UA server via transactions integrated in OPC UA service calls in a transaction context using a transaction management component, such that OPC UA clients trained to carry out transactions each communicate with an OPC UA server using transactions.