dOPC Client Toolkit Help file
Example
procedure TForm1.dOPCEventServer1Event(Sender: TObject; Event: TdOPCEvent);
var
  i : integer;
begin
    for i := 0 to Event.CustomProps.Count- 1 do //for all custom properties
      //show custom property name and value
      Memo1.Lines.Add(Event.CustomProps.Names[i]+ '->'+ Event.CustomProps.ValueAsString[i]);
end;
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