This article is from the Computer viruses FAQ, by David Harley D.Harley@icrf.icnet.uk, George Wenzel gwenzel@telusplanet.net and Bruce Burrell bpb@umich.edu with numerous contributions by others.
Doren Rosenthal offers a shareware utilities suite including a
virus simulator. Many of the AV pros in this group have a low
opinion of the Rosenthal utilities, and regard their author as
more of a virus writer than an anti-virus researcher, and are
annoyed by his habit of offering his utilities as a solution
for problems to which their relevance is not always obvious. As
discussions on Rosenthal-related topics sometimes generate
much heat and bandwidth, some people have taken to adding [DRD]
to the subject header when posting to these threads, to make it
easier to avoid them.
 
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