Abstract: Method for the operation of a multi-processor central control unit of a switching system for use-friendly modification and re-structuring of information appertaining to many subscriber terminals and/or system component parts and sudden switching of the switching service to the new switching service program. A central control unit has many central processors that have access via an arbitrary half of a redundant bus system to arbitrary halves of redundant main memory sections whose halves usually store identical information. Insofar as memories are not redundant, identical information are stored in at least two different memories. In a special operating time, individual processors, one bus system half and some of the memory sections together with a memory of an address administration unit are split-off and interconnected to form an independent, special-purpose computer. In the remainder, the old switching service program continues to operate with the memory sections thereof.