SWI-Prolog -- dde_unregister_service/1

Documentation
- Reference manual
  - Built-in Predicates
    - Windows DDE interface
      - DDE server mode
        
        dde_register_service/2
        
        dde_unregister_service/1
        
        dde_current_service/2
        
        dde_current_connection/2
- Packages

dde_unregister_service(+Service)

Stop responding to Service. If Prolog is halted, it will automatically call this on all open services.