WCF follows WS-* specifications. So it uses WS-Atomic protocol to managed transaction across WCF services. So you can have different WCF services hosted on different computers and they all can run under one transaction unit. The best part of WS-Atomic protocol is that in one transaction you can have heterogeneous WCF services developed in different platform. In other words you can have JAVA and .NET web services running under one transaction. WS-* specifications are globally approved standards to create services.
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