> I now suspect that the data is only being sent once.
> When I receive a certain packet I pop up a messagebox asking the user
> a question and I suspect it is this that is causing the packet to be
> repeated since it is ultimately being displayed by a call from the
> OnDataAvailable event.
> How may this be prevented?  I cannot disable all messge processing in
> my app whilst it's in the OnDataAvailable event.

You can disable socket operation using Pause/Resume methods.
Wether or not you use Pasue/Resume, it is better to go outside of any event
handler by using a custom message you'll post using PostMessage and from the
corresponding event handler, do you modal display.

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