Vista - Why use duplex?

Hi
Since duplex actually uses two channels to communicated, what are the
advantages/disadvantages over using two seperate channels (each application
is a service)?
(one disadvantage I can state is the port 80 conflict with IIS)
In other words, why should I use duplex channel instead of two "normal"
channels?
Thanks

Thanks for the clarification.
Can you direct me to a duplex sample when the client/server share an
interface? (the samples I found all used a proxy class)

"Clemens Vasters [MSFT]" <clemensv@microsoft.com> wrote in message
news:OAt8%23FgNGHA.344@TK2MSFTNGP11.phx.gbl...
> Because you may want to have a session that spans both endpoints. With two
> "normal" channels you'd have to build that yourself. Also, with the TCP
and
> Named Pipe transports, the messages flow back and forth on the
> client-initiated connection and the two channels are really only a logical
> abstraction over the one socket/pipe.
>
> "Adi" <adiavn@hotmail.com> wrote in message
> news:Ovfj6fXNGHA.2644@TK2MSFTNGP10.phx.gbl...
> > Hi
> > Since duplex actually uses two channels to communicated, what are the
> > advantages/disadvantages over using two seperate channels (each
> > application
> > is a service)?
> > (one disadvantage I can state is the port 80 conflict with IIS)
> > In other words, why should I use duplex channel instead of two "normal"
> > channels?
> > Thanks
> >
> >
>
>