dOPC Client Toolkit Help file
Example
//get all Properties from Item 'A100.SP'

Props := TdOpcItemProperties.Create(OPCServer,'A100.SP');
for i := 0 to Props.Count-1 do
  with Props[i] do
    ShowMessage(Format('property %d %s Datatype: %d Value: %s',[Id,Description,Datatype,ValToAStr(Value)]));
Props.Free;
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