This excerpt taken from the NDAQ 8-K filed Aug 3, 2006.
Notice of Meetings; Waiver of Notice
Sec. 4.12 (a) Notice of any meeting of the Board shall be deemed to be duly given to a Director if: (i) mailed to the address last made known in writing to the Corporation by such Director as the address to which such notices are to be sent, at least seven days before the day on which such meeting is to be held; (ii) sent to the Director at such address by telegraph, telefax, cable, radio, or wireless, not later than the day before the day on which such meeting is to be held; or (iii) delivered to the Director personally or orally, by telephone or otherwise, not later than the day before the day on which such meeting is to be held. Each notice shall state the time and place of the meeting and the purpose(s) thereof.
(b) Notice of any meeting of the Board need not be given to any Director if waived by that Director in writing or by electronic transmission (or by telegram, telefax, cable, radio, or wireless and subsequently confirmed in writing or by electronic transmission) whether before or after the holding of such meeting, or if such Director is present at such meeting, subject to Article X, Section 10.3(b).
(c) Any meeting of the Board shall be a legal meeting without any prior notice if all Directors then in office shall be present thereat, except when a Director attends the meeting for the express purpose of objecting at the beginning of the meeting to the transaction of any business because the meeting is not lawfully called or convened.