There can be certain cases when the user cannot or is unwilling to wait until defragmentation process is completed. This is especially useful for full defragmentation, which takes a considerable time. Therefore, Defraggler should be able to turn off the computer when it finishes its job.
To expose this feature in a handy manner, you should add a check-box labeled "Turn off computer when defragmentation completes" or something like that, placed in the "Status" frame of the main window, and on the "Defrag progress" dialog.