Hi,
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...just take into account that the code (AFAIK) can be interrupted by either event (the timer inturrupting the oncomm or the oncomm interrupting the timer)
>

Sort of off thread, but I'm wondering if that is true. I'd expect a higher priority interupt to occur during the execution of a lower priority one - but not the reverse. Admittedly I'm thinking in terms of hardware interupts here but the same logic would surely need to be present in this scenario. The alternative would surely be chaos <g>. I also don't know which of the above would have the highest priority but I'd bet on the Comm event.

Regards,
Viv