An electronic system provides secure and authorized access to data or a user interface on at least one first computer for operating machines from at least one second computer. The data or the user interface on the first computer can be accessed exclusively from the second computer, in that the second computer has an authorization device which stores the access data for personnel with access authorization, and in that access to the data or the user interface on the first computer is preceded by a display apparatus connected to the first computer showing a display which reveals the identified personnel with access authorization from the second computer.