See http://www.slipstick.com/outlook/esecup.htm#autosec for your options.

Signature
Sue Mosher, Outlook MVP
Author of Configuring Microsoft Outlook 2003
http://www.turtleflock.com/olconfig/index.htm
and Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx
>I want to let a program called PRowrite automatically and permanently access
> the Outlook contact database. How do I do that?