This excerpt taken from the HPQ DEF 14A filed Jan 27, 2010.
Dissolution or Liquidation. In the event of the proposed dissolution or liquidation of the Company, the Administrator shall notify each Participant as soon as practicable prior to the effective date of such proposed transaction. The Administrator in its discretion may provide for an Option to be fully vested and exercisable until ten (10) days prior to such transaction. In addition, the Administrator may provide that any restrictions on any Award shall lapse prior to the transaction, provided the proposed dissolution or liquidation takes place at the time and in the manner contemplated. To the extent it has not been previously exercised, an Award will terminate immediately prior to the consummation of such proposed transaction.