# Overview of user interface services

Orion provides a number of utility services that can be used by scripts on Orion pages. These are not services that would be implemented or used by a plugin. Rather, they provide ways for scripts on each page to contribute links, messages, and commands to the title area, and to display dialogs to the end user. A service is also provided for broadcasting or listening to selection changes, which allows synchronization between multiple widgets on a page. For example, this service is used to enable the editor to react to selection changes in the outline panel.