Appearances may be entered either in writing or upon the record of the hearing. Other persons, not parties to a proceeding but having an interest in the subject matter of the proceeding, may participate in the hearing to the extent that they are able to establish an interest, other than that of the public generally, in the subject matter of the proceeding.
N.H. Admin. Code § Odb 203.08
#8490-A, eff 11-22-05