The Clients interface shows a list of configured client resources. This list of clients is a tree structure and shows a number of attributes from the database for each client.
The user may right click on a client item to display a context sensitive menu of what actions can be performed on a client. This menu has options to allow the user to perform commands in the console. These commands include requesting the status of the client, and pruning or purging jobs and files from the catalog. There is also an option to open up a JobList interface with the control for clients already prepopulated with the selected client item.
To understand pruning and purging, please read the Bacula documentation at the following URL: http://www.bacula.org/rel-manual/Bacula_Console.html