When this utility finds a duplicate, it notifies your operating system that there is a duplicate file, in this case, it will show a message stating that "A duplicate copy of the file is present." DoubleKiller will then proceed to either overwrite the existing file, or prompt you to delete it. You should always run this utility after you have unplugged your computer from power, since it will take quite some time for it to completely reboot. Although, you should always run this utility after you have performed all the necessary maintenance on your computer, which will include cleaning up all the temporary files, uninstalling and reinstalling all the necessary programs, and making sure that there are no viruses in your computer.
Unlike some similar utilities, Doublekiller will not delete items that are set to Categorize Shared Items. This makes it much safer because it will not delete items that are needed by other applications. One thing that users must keep in mind is that because this software is used to defragment your hard drive, it may leave certain files untouched, which could make your system vulnerable to security or malware attacks if users do not go through and check their files regularly. This program also has a junk-file remover, which will help you eliminate all unnecessary and irrelevant files and thus make your computer run faster.