A collection of addresses are stored in an address book.  You can have an unlimited number of addresses in any address book.

An address book is saved as a file with the extension of .abk.  You can have an unlimited number of address books.

When Handy Address Book starts up it will automatically open the last address book you had opened.

See Also

Creating a New Address Book

Opening an Existing Address Book

Saving an Address Book

Publishing an Address Book to the Web