Change action on "lock screen" button

[Rashid N. Achilov]

Can I change action on "lock screen" button, i.e call external program here?
-- 
   With Best Regards.
   Rashid N. Achilov (RNA1-RIPE), Web: http://granch.ru/~shelton
   Granch Ltd. system administrator, e-mail: achilov [at] granch [dot] ru
   PGP: 83 CD E2 A7 37 4A D5 81 D6 D6 52 BF C9 2F 85 AF 97 BE CB 0A
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