What?? I was right again??? <looks around nervously for signs that the walls 
may be caving in>

Bob


On Dec 2, 2010, at 2:41 PM, Gregory Lypny wrote:

> Hi Everyone,
> 
> Yesterday I posted a long question (sorry about that) concerning data lost 
> from a web form submitted through my On-Rev site, where two students appear 
> to have submitted quiz answers from the same IP address at virtually the same 
> time.  Bob Sneidar replied asking whether I had accounted for the possibility 
> that more than one person could sign on to my site from the same IP, and I 
> had said that I have not prohibited that.
> 
> Well, I have since spoken to the students who submitted blank quizzes, and it 
> turns out that they live together, share a wireless network, and each has her 
> own computer.  This probably means that they have their router set to share a 
> single IP address or some such thing.  I guess what I should do is revise by 
> sign-in script to disallow multiple sign-ins from the same IP.
> 
> Regards,
> 
> Gregory
> 
> 
> 
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