DCOM is the COM infrastructure for cross-process communication. The .NET Framework supports a number of pluggable channels and formatters for cross-process communication. When making transitions between managed and unmanaged code, the .NET Framework uses the COM infrastructure, specifically, DCOM. All scenarios using COM+ services use managed-to-unmanaged transitions, and thus use DCOM by default. The .NET Framework also supports SOAP, the Simple Object Access Protocol, for cross-process communication where interoperability is critical.