Do we need....?

Some of the following features can be provided at the cost of greater complexity for the infrastructure, the client, or both. Other features might be provided quite easily, but at a cost of performance. It might be that some features are needed for messaging outside the desktop, but not within it.

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Security?

• How much?

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Encryption?

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Guaranteed delivery?

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Guaranteed ordering?

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Queuing of messages?

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Transactions?