Because both have wide support in the market, you'll find that many EAI systems, including those from Bridges for Islands and Saga Software, support both. Not all calls between programs need an immediate response. Message queues deal with these calls asynchronously and can resend them if necessary. Message queues are an excellent means of connecting disparate systems, especially across the Internet. Support for the most popular message-queuing systems, such as IBM's MQSeries and Microsoft MSMQ, is common.
Transactions are a critical part of all e-business.
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