FYI that’s the 2nd modified version. 
The first version ends much differently.  See tha author note as to the background. 

Earl 

Sent from my iPhone

> On Sep 19, 2021, at 11:30 PM, David Arnold <davida@pobox.com> wrote:
> 
> I think that’s the first time I’ve seen Gerrold’s When H.A.R.L.I.E was One cited alongside Shockwave Rider as anticipating computer viruses.
> 
> Since we’re saving each other searching today, here’s a link to the author’s page for anyone else who, like me, hasn’t read it and wants to. 
> 
> https://www.gerrold.com/book/when-harlie-was-one/
> 
> 
> 
> 
> d
> 
>>> On 20 Sep 2021, at 13:05, jnc@mercury.lcs.mit.edu wrote:
>>> 
>> https://googlethatforyou.com/?q=Tom%20Duff%20Virus
>> 
>>    Noel