The subpoena may be served on a witness at any place in the commonwealth.(b) If a majority of the commission directs the issuance of a subpoena, thechairman shall issue the subpoena in the name of the commission.(c) If the chairman is absent, the chairman???s designee may issue a subpoena or other process in the same manner as the chairman.(d) If necessary to obtain compliance with a subpoena or o