Add User Event in Active Directory calling a program

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http://serverfault.com – Is it possible to call a program when a user is added or password updated in Active Directory? If I had to I could store the password as a sha1 hash in an attribute. If I didn't have to that would be best. I need to do this to create users and modify users on an external website that doesn't support LDAP but has an API that allows adding users and updating passwords. (HowTos)