RE: ATTENTION Key

[Peter Coffin <phcoffin@xxxxxxxxxx>]

Dave writes:

>>>I'm not sure I understand what you mean by sending an INTERRUPT,
>>>Peter. With a TELNET session running on the AS400, pressing the
>>>ATTENTION key gives you the Send TELNET Control  Functions menu. The
>>>first option, Interrupt process, is used to cancel a process on the
>>>server. I can't find anything in the TCP/IP manual about sending an
>>>INTERRUPT. No INTERRUPT function is listed in the PC5250 keyboard
>>>map. What are you doing your "quick test" on?
>>
>> That'd be the one. Try it.
>
>Try what?
>

IP, Interrupt Process. I may not remember a heck of a lot about 3270
protocols, but I do know that those descriptions on the telnet menus
are the TCP/IP names for functions, and I do not recall an ATTN
function on any TCP/IP telnet function chart. Everything I look at
says "ESC on ASCII terminals maps to SYS ATTN on 3270". During a
TN5250 session between two AS/400s sending IP behaves like being signed
on directly and pressing the key labelled ESC on my keyboard. The same
behavior is seen connecting via a TN3270 session from an AS/400 as the
client to an ES/9000 system: sending IP behave like a direct-connect
pressing of the key labelled ESC, which sends SYS ATTN. Therefore, it
is likely that IP indeed maps to SYS ATTN under TN5250 and TN3270. Do
not be alarmed about the name Interrupt Process, or the TCP manual's
claim that it "Interrupts, cancels, or suspends a process that has
started on the server system." You're sending the signal to an entirely
different layer of the communcation link, and the telnet server is
going to intercept that function and remap it before it hits the
actual process that you're running on the remote machine. We've
experimented with it, it looks like the telnet server maps IP to SYS
ATTN, so that's what you should try.

Peter H. Coffin
phcoffin@us.ibm.com
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