Final answer:
To register a custom auto-configuration in a computer program, define a configuration class and annotate it with the Configuration annotation. Use the Bean annotation to register custom beans.
Step-by-step explanation:
To register a custom auto-configuration in a computer program, you typically need to define a configuration class and annotate it with the Configuration annotation. Within this class, you can use the Bean annotation to register custom beans. These beans can be configured with specific properties or dependencies as needed. By registering the custom auto-configuration, the program can then use these custom beans in its application context.