>         So if the users would save the virus to disk and then run it,
> what's the savings? 

the virus doesn't propagate as quickly, nor to as many people,
before it is detected and countermeasures are put in place.
yes, this does make a significant difference.

>         You could have senders sign any executables. That might help a little,
> as long as the sender's machine hasn't been compromised.
 
this would also help, but we'd need a better way to verify the sender's 
signature than we have now.

Keith

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