As a minimum, each common address must be given a "code" and an address. Via this code (or the built-in search window), your users are then able to drop that address into any document. But the common address feature also allows you to enter additional information about your contacts - information such as a salutation, an email address and phone, fax and mobile numbers. This additional information can be accessed via the Variable Prompt functions of I-Deal Docs and thus automatically "merged" into documents as part of the generation process.