On Mon, Jun 1, 2015 at 8:17 AM, Paul Gilmartin < 0000000433f07816-dmarc-requ...@listserv.ua.edu> wrote:
> On Sun, 31 May 2015 19:03:23 -0400, Thomas Conley wrote: > >> > >> An example of how IBM hardware design outpaces its software design. > >> A couple decades after an IBM terminal supported multiple sessions, > >> ISPF doesn't support a user's having multiple sessions. > > > >Incorrect. ISPF supports multiple user sessions as of z/OS V2R1. > >However, the only 'sploiter Luthy, is z/OSMF. > > > How do I get past the > > IKJ56425I LOGON rejected, UserId USER already logged on to system MVS > > ... in order to start an additional TSO session in order to start an > additional > ISPF session? > > The term "only [ex]ploiter" implies severe limitations. > _You_ cannot because, IIRC, you are not a sysprog who can install exits. Either the IKJEFLD or IKJEFLD1 exit can be used to set the "Don't ENQ" bit in the control switches. Normally, TSO does a ENQ on your RACF id as a resource name and a queue name of SYSIKJUA. This is what is used by TSO to prevent multiple logons to the same ID. In my shop, I have an RNL which changes this ENQ from a SYSTEMS (sysplex wide) ENQ to a SYSTEM (individual image) ENQ __for specific RACF ids__. Basically what this does is allow Production Control and Tech Services, but no one else, to log on to each system image in the sysplex concurrently. What just occurred to me is that an APF authorized program (either batch or TSO, whichever) could be coded so that _authorized_ people could run it and have it release the ENQ issued by TSO so that they could logon on for a second time. Of course, this may cause the LOGOFF processor to abend if it tried to do an unconditional DEQ of the user id. There were previous posts, years ago, about why the IBM TSO people did this. IIRC, it was mainly due to some serious serialization problems and this ENQ was a fast patch which never was addressed. Mainly because many view TSO as a resource hog any way. Especially back in MVT days. ref: http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/ikj4b4a0/3.3.11.6.1 > > -- gil > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > -- My sister opened a computer store in Hawaii. She sells C shells down by the seashore. If someone tell you that nothing is impossible: Ask him to dribble a football. He's about as useful as a wax frying pan. 10 to the 12th power microphones = 1 Megaphone Maranatha! <>< John McKown ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
