One of the following mechanisms determines which versions are in your UCM views:
On UNIX® systems:

On Windows® systems:

You can change the set of elements that are loaded in your view at any time. For example, if you work on a discrete subset of your project files, you can save time during update operations by loading only that subset into your view.
For dynamic views, VOBs that contain the elements in your stream are activated. Then, a view_server process is used to arrange the VOB data into files in a directory tree.