## What are Add-ons? ¶

Over the years, a number of users have contributed various functions and packages adding features and customizations to VM. Many of them have been collected and included in the standard VM distribution. Some of the packages have their own manuals. For example, the “VM Personality Crisis” package has a manual, See top in Personality Crisis for VM. Most others have never been documented.

This part of the manual is an effort to provide some rudimentary documentation for these add-ons.

The add-ons are classified into:

- Customizations. Small functions or settings that can be tagged on top of VM to make it easier to use, either in general or in particular environments.
- Add-ons. More elaborate features.
- Packages. Full-blown packages that add new functionality or interface to other packages in your environment.