The Open Group has a DCOM implementation called COMsource. Its source code is available, along with full and complete documentation, sufficient to use and also implement an interoperable version of DCOM. According to that documentation, COMsource comes directly from the Windows NT 4.0 source code, and even includes the source code for a Windows NT Registry Service. The TangramCOM project is separated codes from Wine, to implement DCOM on Linux for smartphone.