To produce a controller or regulator (1), a control or regulation process (3) is first designed and simulated on a development system (20). The process source code (25) for a target system (2) arranged in the controller or regulator (1) is then generated, and also a description file (28, 29) in HTML and/or XML format which, among other things, describes the parameters for the controller or regulator (1). Tags which characterize the parameters are used in the description file (28, 29). The description file (28, 29) is then converted, in a web server generator (30), into data and source code (31, 34) for a web server (5) which can run on the target system (2). In this context, the web server generator (30) and/or web server (5) use/uses the tags to insert input and output elements which can be used for setting and reading the respective parameters. The present system can be used for easily producing an interface for controlling the process (3) running on the target (2), which interface can be used by any client computer (7) without special software.