dOPC Client Toolkit Help file
Example
var
  ItemList : TdOPCItemList;
begin
  ItemList :=  TdOPCItemList.Create(OPCServer.OPCGroups[i]); // we want to read values of all Items of the first Group
  OPCServer.OPCGroups[i].SyncRead(ItemList,false); // read values from OPC server
  ItemList.CheckOPCErrors('Read Items...',false);  // show errors
  ItemList.Free;
end;
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