code: private String createString(String f)
      {
          StringBuilder sb = new StringBuilder();
          sb.append("p2pToken="+p2pToken+f);
          sb.append("vaSpaceToken="+vaSpaceToken+f);
          return sb.toString();
      }
docs: Creates and returns a string representation of this object,
  using the given separator for the fields
  
  @param f Separator
  @return A String representation of this object