How do I respond to a specific post?

[abacus.01 at mailnull.com]

At first let me all thank you very much
for your answers to my questions.

Is there a way to respond to a specific post
in a thread-hierarchy?
Because sending messages simply to the or-talk-list
with a message-subject does seem to result in a 
"first come/fist shown" order.

Thanks

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