37. The panel may at any time during a Proceeding address questions in writing to one or more of the Participants. The panel shall deliver the written questions to the Participant or Participants to whom the questions are addressed through the Secretariat, which shall also provide for delivery of copies of the questions to all other Participants.
38. A Participant to whom the panel addresses written questions shall deliver a copy of any written reply to the Secretariat, which in turn shall provide for the delivery of copies of the reply to all other Participants. Each other Participant shall be given the opportunity to provide written comments on the reply within five days after the date of delivery.