VirusScanner has many usefull features as the periodical check of every memory vector, of the startup-sequence and of the process you have in background. This operations are performed without any loss of processor speed, unlike Virus Checker.
VirusScanner recognises every file/link virus available at the moment and using if possible the 'New Virus Database' feature let VirusScanner knows also virus that it originally doesn't know. For the news ones look at the virus wanted list.
VirusScanner uses the SHI bootblock.library, so with an update of the bootblock.brainfile it can recognise and delete any new bootblock virus.
VirusScanner uses the SHI removelink.library, so with a new version of the library you can kill new viruses.
VirusScanner uses the SHI unpack.library, os it can decrunch and check files compressed withmore than 100 different crunchers.