Protected Overridable Sub HistoryReadAtTime( _
   ByVal context As ServerSystemContext, _
   ByVal details As ReadAtTimeDetails, _
   ByVal timestampsToReturn As TimestampsToReturn, _
   ByVal nodesToRead As IList(Of HistoryReadValueId), _
   ByVal results As IList(Of HistoryReadResult), _
   ByVal errors As IList(Of ServiceResult), _
   ByVal nodesToProcess As List(Of NodeHandle), _
   ByVal cache As IDictionary(Of NodeId,NodeState) _
) 

protected virtual void HistoryReadAtTime( 
   ServerSystemContext context,
   ReadAtTimeDetails details,
   TimestampsToReturn timestampsToReturn,
   IList<HistoryReadValueId> nodesToRead,
   IList<HistoryReadResult> results,
   IList<ServiceResult> errors,
   List<NodeHandle> nodesToProcess,
   IDictionary<NodeId,NodeState> cache
)