CGoering@nyiso.com writes to the NYISO_TECH_EXCHANGE Discussion List:

The NYISO is reserving hours beginning 00:00, 03:00, 04:00, 06:00, 07:00,
10:00 - 14:00, and 17:00 - 20:00 in the May 22, 2001 Real-Time Market as
well as the following hours per ECA20001006B to verify prices:

PJM:  00:00 - 03:00, 05:00, and 06:00
OH:   06:00
HQ:   03:00, 06:00, and 23:00
NE:   06:00, and 23:00

Prices in the May 23, 2001 Day-Ahead Market are correct.

This e-mail information is a copy of the official posting which can be
found at the following address on our website:
http://mis.nyiso.com/public/htm/OperMessages/CurrentOperMessages.htm#mm