# BeOS Sample Code: Add-ons

Add-ons are shared libraries used throughout the BeOS to add functionality to applications, the Tracker, and the OS itself.

For more information, see the corresponding category in the online Developer Library.

### Projects

iso9660 | A file system add-on that reads ISO 9660 volumes.
LoadAddon | How to build and load an add-on.
MailMarker | A Tracker add-on that changes the status of e-mail messages.

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BeOS Release 4.5
Copyright © 1999 Be, Inc.