You can change the Contacts file that Notes uses to find email address, or you can use more than one Contacts file. If you use more than one Contacts file, then each of the local contacts files appear as a choice when you want to search for a name in dialog boxes such as the "Select Address" ...

Your Contacts file is the file in which all of your contact entries are stored. By default, the file is called names.nsf, and is created for you automatically. When you address a message to a person, IBM Lotus Notes looks in your Contacts file (names.nsf) for the person's mail address. You can ...