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# Application-Level Functionality

This section presents the main API access point to the Mudbox SDK.

The following classes are responsible for accessing application-level functionality using the Mudbox SDK, such as preferences and the scene graph root node:

- Kernel - The main API access point to Mudbox, contains the most basic functions and data. This is a singleton, and access is available throught the function Kernel().
- Preferences - Holds Mudbox application preferences. Most of the data members will be removed from the SDK in future releases. For more information about adding an item to preferences see Preferences::Integer.

#### Topics in this section

- Menu Customization
- Logging and Debugging Functions
- Displaying Messages and Progress Notifications