ITcHmiSrvExtHost.RegisterListener MethodOverload List Name Description RegisterListener(Context, IListener) Registers the specified IListener at the TwinCAT HMI server. RegisterListener(Context, IListener, Value) Registers the specified IListener at the TwinCAT HMI server using the specified settings. Reference ITcHmiSrvExtHost Interface TcHmiSrv.Core Namespace Further InformationITcHmiSrvExtHost.RegisterListener Method (Context, IListener)ITcHmiSrvExtHost.RegisterListener Method (Context, IListener, Value)