Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!tut.cis.ohio-state.edu!ucbvax!bbs.UUCP!karl From: karl@bbs.UUCP (Karl Denninger) Newsgroups: comp.protocols.ibm Subject: Re: 3270 ATTN key -- what does it generate? Message-ID: <9012272109.AA07995@lilac.berkeley.edu> Date: 27 Dec 90 16:57:25 GMT Sender: daemon@ucbvax.BERKELEY.EDU Reply-To: Karl Denninger Organization: The Internet Lines: 27 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.