ITcHmiSrvExtAsyncHost.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 ITcHmiSrvExtAsyncHost Interface TcHmiSrv.Core Namespace Further InformationITcHmiSrvExtAsyncHost.RegisterListener Method (Context, IListener)ITcHmiSrvExtAsyncHost.RegisterListener Method (Context, IListener, Value)