Re: TN3270 *from* a host??
- From: chrismason@xxxxxxxxxxxx (Chris Mason)
- Date: 26 Jun 2008 04:24:29 -0700
Andrew
I believe Peter Hunkeler is putting us more or less on the right track here in
stating that there is no support for the 3270 data stream from the TELNET
client function available from TSO. Of course there may be other vendors
somehow supplying this function and, taking his post at face value, it seems
Dave Gibney not only knows of one but is using one.
Meantime what is all this about "2 SSCPs in the same Domain"? I can vaguely
see - because I used to be a teacher and I had to try to imagine how
students' ideas could get tangled - that you may imagine that a VTAM
application talking to another VTAM application has to be cross-domain. This
is not true: two VTAM applications running on the same system and activated
by the same VTAM SSCP can happily talk to one another. However, you seem
to be talking about a TELNET client on one system talking to a TELNET server
on another system which, if both applications were using the VTAM API would
be cross-domain. However, the TELNET client function in z/OS does not rely
on the VTAM API. Moreover the TELNET connection has nothing to do with
VTAM domains. Read that twice since I see this false connection appears
more than once in your post. The only involvement of VTAM in your scenario is
from the TELNET server, which happens, confusingly IMHO, to be called the
TN3270 server but does need to be distinguished from the z/OS UNIX TELNET
server, to the accessed SNA application.
Isn't it time for "a show and tell", meaning a demonstration from your customer
of what he/she is actually doing and a report back to the eager listeners here
in the list?
It may be this is all confusion over which server is being used. I haven't used
the z/OS UNIX TELNET server (otelnetd) but if it can do what I imagine it may
be able to do, it may give the impression that the 3270 data stream is being
supported. Assuming my memory is good, I could use TELNET from one AIX
system to another AIX system and manipulate SMIT with the cursor keys in
what someone familiar with using 3270 devices might describe as a "full-
screen" environment. What's interesting about the comparison of the two
environments is that the SMIT application reacts to those cursor movements
in a way that would never happen with 3270 since there can be an immediate
reaction to the character entered rather than having to wait for the entry of
an AID key such as ENTER.
Chris Mason
On Wed, 25 Jun 2008 22:56:17 -0700, Andrew McLaren
<amcllist@xxxxxxxxxxxxxxx> wrote:
Hi all,
Kind of a weird question I know, but ... it has been a day full of weird
questions.
A customer would like to know if they can open a TN3270 session *from*
one z/OS host, to another z/OS host?
I do not believe this is possible. For a start, you cannot have 2 SSCPs
in the same Domain; so how can you have a Dependent LU?. Besides, there
is no TN3270 client (AFAIK) for z/OS. However my customer - not on the
face of it, a fool - sincerely believes that this is what he is doing,
today.
So who is right? Can I open a TN session to a host in another domain???
Many thanks for any clues
Andrew
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