Whilst the ways that one does command-line stuff and full-screen editing with block-oriented (rather than character-oritented) terminals are an important differ

Whilst the ways that one does command-line stuff and full-screen editing with block-oriented (rather than character-oritented) terminals are an important difference to learn, there are, of course, things here that are not different. * There's still "object" code, and a "link (edit)" step. * The function key mappings such as F3 for Exit are Common User Access standards, and were to be found in some Microsoft and IBM softwares for PC operating systems in the 1980s; most prominently perhaps in the various "E" editors and clones thereof available on PC-DOS and OS/2. * The underlines for the menu item hotkeys are also Common User Access things, as is F10 for bringing focus to the menu. M. Bellotti would gain by learning about the "TE" line command. Xe would also gain by not abusing the word "legacy", especially since the so-called "legacy paradigm" of IBM's "panels" on block-oriented terminals is pretty much the same paradigm as forms on a WWW browser. (-: * http://jdebp.info./FGA/legacy-is-not-a-pejorative.html http://jdebp.info./FGA/legacy-is-not-a-pejorative.html And the doco, IBM's and others', is not really wildly different, in both range and content, to other platforms'. * Gary DeWard Brown (2002). zOS JCL. John Wiley & Sons. ISBN 9780471426738. * https://www-01.ibm.com/servers/resourcelink/svc00100.nsf/pages/zOSV2R3SC193621/$file/f54em00_v2r3.pdf https://www-01.ibm.com/servers/resourcelink/svc00100.nsf/pag... * Mike Ebbers, John Kettner, Wayne O'Brien, and Bill Ogden (2012). Introduction to the New Mainframe: z/OS Basics. IBM Redbooks. ISBN 9780738435343.