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- xThe ANTI Virus
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- There are two known strains of the ANTI virus. Both strains were first
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- discovered in France. The ANTI A strain was discovered in February,
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- 1989. The ANTI B strain was discovered in September, 1990.
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- ANTI does not infect the System file. It only infects applications and other
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- files which resemble applications (e.g., Finder). ANTI does not infect
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- document files. It is less contagious than the INIT 29 virus, but more
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- contagious than the Scores and nVIR viruses. It is possible for an
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- application to become infected even if it is never run.
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- Due to a technical quirk, ANTI does not spread at all under System 7 or
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- under System 6 when MultiFinder is used. It only spreads when Finder is
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- used under System 6.
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- There is an error in ANTI which causes it to slightly damage applications
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- in such a way that Disinfectant cannot perfectly repair them. In other
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- words, the application as repaired by Disinfectant is usually not identical
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- to the uninfected original application. The damage is very minor,
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- however, and in almost all cases it does not cause any problems. If you
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- experience problems with an application which was infected by ANTI and
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- repaired by Disinfectant, we recommend that you delete the repaired copy
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- and replace it by an uninfected original copy. This is good advice in any
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- case.
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- (For the technically inclined, the error in ANTI is that it clears all the
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- resource attributes of the CODE 1 resource. Disinfectant has no way to
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- know the values of the original attributes, so it leaves them cleared on
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- the repaired application. The only effect of this error is that the repaired
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- application may use memory slightly less efficiently than the original
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- version, especially on old Macintoshes with the 64K ROMs.)
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- As with the other viruses, ANTI does not intentionally attempt to do any
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- damage other than spread itself. As with all viruses, however, it can still
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- cause problems.
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- The string “ANTI” appears within the virus, hence its name.
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- Even though the B strain of ANTI was not discovered until about 19
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- months after the A strain, it appears that the B strain was actually
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- written before the A strain. The A strain of the virus contains special
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- code which neutralizes any copies of the B strain which it encounters. It is
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- possible for an application to be infected by both the neutralized version
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- of the B strain and by the A strain. Disinfectant reports that such
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- applications are infected by both strains and repairs them properly.
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- Other than the special code in the A strain which looks for and neutralizes
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- the B strain, there are only minor technical differences between the two
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- versions of the virus.
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