Context_ui allows you to manage contexts for different portions of your site. You can think of each context as represeting a "section" of your site. For each context, you can choose the conditions that trigger this context to be active and choose different aspects of Drupal that should respond to this active context.
Installation
Context_ui can be installed like any other Drupal module -- place it in the modules directory for your site and enable it (and its requirement, context) on the admin/build/modules page.
You will probably want to install context_ui_contrib as well, which adds context_ui integration for several contrib modules including Views.
Example
You want to create a "pressroom" section of your site. You have a press room view that displays press release nodes, but you also want to tie a book with media resources tightly to this section. You would also like a contact block you've made to appear whenever a user is in the pressroom section.
- Add a new context on admin/build/context
- Set the section identifier / value to "pressroom"
- Under the "set context" dialogue, associate the pressroom nodetype, the pressroom view, and the media kit book with the context.
- Choose the pressroom menu item to be set active under the "respond to context" items.
- Add the contact block to a region under the block visibility settings.
- Save the context.