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PMDF-MB400 is implemented as a single PMDF channel named XAPI_LOCAL, responsible for converting between RFC 822 and MIME, the addressing format and message representation used by PMDF, and the P1/P2/P22 representation used by X.400. The conversion is performed by the X400_TO_MIME and MIME_TO_X400 executable programs which service the XAPI_LOCAL channel. These same two channel programs also manage the XAPI interface with MAILbus 400.
Unlike PMDF-X400, which uses a two step procedure and multiple channels, PMDF-MB400 uses only a single channel, XAPI_LOCAL, since it does not need to implement X.400 Reliable Transfer Service (RTS).  | 
  
The PMDF-MB400 configuration utility1 will create the file 
x400.chans in the PMDF table directory2 
containing the definition of the above-mentioned channel.
      1  PMDF CONFIGURE MB400 on OpenVMS; 
        
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