Help FIle - 'ConnectionCenter' of ProSteel for AutoCAD

Dear Sir or Madam:
Where is help file or information about 'ConnectionCenter' of ProSteel for AutoCAD please?
Thanks in advance!
William Wu
Civil/Structural Designer

Direct  403.930.4582
Address  Bankers Hall West Tower - 3500, 888 – 3rd Street SW, Calgary, AB  T2P 5C5
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