Mike,
have a look at this MSMQ example from MSDN:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/msmq/msmq_using_transactions_1gz2.asp
I don't know if GCI presents any special problems under windows but this
looks like it might work to send a "single message transaction"
guaranteeing once only delivery to a transactional queue.
Obviously you need to alter the sample function to actually take an
input message.
Craig
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