Certain example embodiments concern a gateway server system including a gateway server for making at least one SOAP and/or XML-based web service accessible to at least one RPC client using at least one mapping file. The at least one mapping file includes definitions for translating at least one first RPC request message from the at least one RPC client to at least one web service call. The gateway server includes a configuration interface to receive and store the at least one mapping file. The gateway server is configured to create at least one first sub-program for processing the at least one first RPC request message in accordance with the at least one mapping file. The configuration interface is further configured to receive at least one updated mapping file and overwrite the corresponding at least one stored original mapping file, without affecting the processing of the at least one first subprogram.