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ISPF (Interactive System Productivity Facility) is a tool set for the IBM z/OS (MVS, OS/390) operating system for mainframe computers. It includes a screen editor, the user interface of which was emulated by some microcomputer editors sold commercially in the late 1980s.

It primarily provides a IBM 3270 terminal interface with dialogs to run tools on the system under TSO. ISPF is frequently used to manipulate z/OS data sets via its PDF (Product Development Facility).

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