Shared Ethernet card with NT on IPCS

We have a S10 running os/400 V4r2 with NT server on its IPCS card. We 
are sharing the Ethernet card with both servers. Also on the same 
network we have two model 400 running os/400 V4r2 with NT on their FSIOP 
cards.

Users are  using client access over TCP/IP to access the AS/400 through 
the shared Ethernet card.

Does anybody have any information about how the virtual network between 
the AS/400 and the NT server on every machine is actually working (books 
or sites)

AS/400==============NT=================LAN
       token ring          Ethernet shared
        TCP/IP              TCP/IP


If I made on the shared Ethernet interface (line on the AS/400) an APPC 
controller would the system uses SNA over Ethernet natively on the LAN 
or it will be a TCP encapsulation. Is there a reference about this issue 
(The programmer wants to use DDM files between these systems as we will 
move them to remote sites later on provided that our routers will 
support SNA over frame relay)

Thanks


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