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ISPF
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==Customization == ISPF is designed to be customized for each user (a fairly new concept in 1974, when it was introduced). Some of the customization is global and some is specific to an ISPF application. It supports a set of 24 [[function keys]] which, when pressed, execute commands.<ref name="ISPF.FunKeys">[https://books.google.com.ua/books?redir_esc=y&hl=uk&id=Now8YwGB-bgC&q=VM%2FCMS#v=onepage&q&f=false "ISPF/PDF MVS/TSO, VM/CMS"]. ''[[Computerworld]]''. April 12, 1982. [https://pdfguru.com/ p. 8]. {{ISSN|0010-4841}}.</ref> These are customizable: Each user can replace the default commands assigned to any key with his own preferred command (or series of commands). User settings are stored centrally, so that the user can logon from any terminal and that session will remember their previously-chosen commands for each key. Most [[personal computer]]s copied this, and have a set of 12 or 24 function keys. Even some defaults have endured: the [[F1 key]] triggers a "help" function on a large number of mainframe & [[Personal Computer|PC]] programs. ISPF remembers each user's choices for such things as screen colors & layout, the location of the command line and scrolling preferences. It also remembers the last-used data set names on each panel, so the next time the panel is used the names are already filled in. This is very convenient for mainframe programmers because they frequently work with the same files repeatedly.
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