From a Customer E-Mail:

For example, if you have twelve different files (tasks are ment here) you would like to assign to a user, being able to perform the action once for all of them would be an important capability. Similarly, deleting and exporting files or getting reports should be something that can be run for a batch of files. Gmail has a good UI example: you select check boxes next to multiple items and then click a UI element to perform the associated action on all of them.