dOPC Client Toolkit Help file
Example
with OPCServer.OPCGroups do
  for i := 0 to Items.Count -1 do //for all groups in the collection
    ShowMessage(Items[i].Name); //show group name

or

with OPCServer do
  for i := 0 to GroupCount -1 do //for all groups in the collection
    ShowMessage(OPCGroups[i].Name); //show group name
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