> > I assume you are talking about the lower layers?  
> 
> I think I should have thought about it a bit more before sending that
> off.  It doesn't really make that much difference.
> 
> However, I've been fortunate enough to work on SNA communications
> between an AS/400 and a DOS PC.  Part of the protocol stack used (SNA?
> LU 6.2?)  sends and receives the data in specified size packets, not
> as a bytestream like TCP.

I see what you mean.  LU 6.2 has record bounderies that the programmer is
aware of that you don't see in TCP.

What I thought you meant was that SNA was a connectionless protocol, which
obviously it is not.

Mike

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