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Article #814

Re: 3270 ATTN key -- what does it generate?

#814
From: Karl Denninger
Date: Thu, 27 Dec 1990 16:57
27 lines
1737 bytes
In article <374@rufus.UUCP> drake@drake.almaden.ibm.com writes:
>The ATTN key is, as was already mentioned, an out-of-band communications key.
>It's the moral equivalent of the "escape" key in many telnet implementations;
>you hit the escape key (often ctl-t) and the telnet client prompts you to
>enter various commands.  When the command completes you're put back into your
>telnet session.
>
>ATTN is used similarly to allow 3270s to exit their host session and talk to
>the network.  This allows users to forcibly log off from hosts (a la ctl-t Q)
>and other such things.  
>
>Since ATTN's used to talk to the network (VTAM, the 3x74 et al), not the host,
>I'm not sure how you'd implement it on a telnet server.

The Mitek uses a IAC BREAK (ala out-of-band Telnet command) to do this.

Let's hope IBM's TCP/IP for MVS supports this.... otherwise when we get real
TCP/IP loaded on the 3090s around here, we'll not be happy anymore!

Right now what we have works...

--
Karl Denninger	AC Nielsen
kdenning@ksun.naitc.com
(708) 317-3285
Disclaimer:  Contents represent opinions of the author; I do not speak for
	     AC Nielsen on Usenet.
Technical Details
Message-ID: <1990Dec27.165725.22446@naitc.naitc.com>
Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!tut.cis.ohio-state.edu!att!linac!midway!gargoyle!ddsw1!bbs!karl
References: <1990Dec15.014654.28204@naitc.naitc.com> <4467@lib.tmc.edu> <374@rufus.UUCP>

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!tut.cis.ohio-state.edu!att!linac!midway!gargoyle!ddsw1!bbs!karl
From: karl@naitc.naitc.com (Karl Denninger)
Newsgroups: comp.protocols.ibm
Subject: Re: 3270 ATTN key -- what does it generate?
Summary: You do it with an IAC BREAK command
Message-ID: <1990Dec27.165725.22446@naitc.naitc.com>
Date: 27 Dec 90 16:57:25 GMT
References: <1990Dec15.014654.28204@naitc.naitc.com> <4467@lib.tmc.edu> <374@rufus.UUCP>
Reply-To: karl@bbs.naitc.com (Karl Denninger)
Organization: A.C. Nielsen Co.
Lines: 27