This excerpt taken from the CVS 8-K filed Aug 15, 2006.
. Revocation and Effect of Consents and Waivers. Until an amendment, supplement or waiver becomes effective, a consent to such amendment, supplement or waiver by a Holder of a Debt Security of any series is a continuing and binding consent by the Holder of a Debt Security of such series and every subsequent Holder of a Debt Security of such series or portion of a Debt Security of such series that evidences the same debt as the consenting Holders Debt Security, even if a notation of
the consent or waiver is not made on any Debt Security. However, any such Holder of a Debt Security of such series or subsequent Holder of a Debt Security of such series may revoke the consent as to its Debt Security if the Trustee receives written notice of revocation before the date the waiver, supplement or amendment becomes effective. An amendment, supplement or waiver shall become effective in accordance with its terms and thereafter shall bind every Holder of a Debt Security of such series.
The Company may, but shall not be obligated to, fix a record date for the purpose of determining the Holders of Debt Securities of any series entitled to give their consent or take any other action described above or required or permitted to be taken pursuant to this Indenture. If a record date is fixed, then notwithstanding the immediately preceding paragraph, such Persons which were Holders of Debt Securities of such series at such record date (or their duly designated proxies), and only such Persons, shall be entitled to give such consent or to revoke any consent previously given or to take any such action, whether or not such Persons continue to be Holders of Debt Securities of such series after such record date. No such consent shall be valid or effective for more than 120 days after such record date.