A program that scans and cleans your computer Back Orifice Server program made by group called Cult of the Dead Cow. BO currently only runs in Windows 95/98. When BO Server running on your system, people have access to your computer to view and delete files, see passwords, restart computer, etc. BO can be configured to allow access only topeople who know password for it, but in most cases it can be used in default configuration and let another to damage your system.