2) AntiGen (with a capital G) is freeware developed by Fresh Software to detect the presence of Back Orifice on a machine running Microsoft Windows. AntiGen removes Back Orifice and cleans up system changes that have been made, using a wizard interface. According to Fresh Software, AntiGen was the first application to offer protection from Back Orifice in 1998.
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These product names are apparently derived from the biological term, antigen, which is a foreign substance in the body that stimulates the production of an antibody (which fights disease).