>I'm one of the people who does this.  Up until your message, I didn't 
>realize that this caused a problem.  I guess I was under the impression 
>that threads were defined by the subject and if the subject changed, it 
>would be interpretted as a new thread.  If this is not the case, what 
>field is keyed on to determine whether something is a thread or not?

So am I, and wondering the same thing.
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