Okay, here's a breakdown of information about ISPF based on the provided web page content:

**ISPF (Interactive System Productivity Facility)**

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**What it is:** ISPF is a full-screen editor and dialogue manager. It's a software product specifically designed for the **z/OS** operating system, which runs on IBM mainframes.
**Core Function:** It provides an interface, primarily through IBM 3270 terminals, using **panels**. These panels contain menus and dialogs to run various tools and utilities on the underlying Time Sharing Option (TSO).
**How it Works:** Most ISPF panels serve as a convenient interface to perform tasks. The actual work is typically done by executing modules from IBM's mainframe utility programs. ISPF itself acts as the front-end.
**Key Component (ISPF/PDF):** It frequently uses its **Program Development Facility (ISPF/PDF)** for manipulating z/OS data sets. PDF refers specifically to this development tool within ISPF.
**User-Extensible:** ISPF can be used as an application programming interface (API) by other vendors to create their own z/OS products that integrate with the familiar ISPF interface.
**History:**
Originally called SPF (Structured Programming Facility) for the MVS system in 1974.
The name evolved through System Productivity Facility and eventually became Interactive System Productivity Facility.
IBM ported ISPF/PDF to its VM/SP operating system in 1985, where it could use either PDF or XEDIT as the editor.
It can also be invoked from within a z/OS batch job.
**Resources (as per the website):**
The page lists several ISPF manuals available for download as PDFs, covering topics like Dialog Development, Edit Macros, Messages, Planning/Customizing, References, Services, and Software Configuration/Library Management (SCLM).
It mentions sponsoring organization: Software Diversified Services (SDS).
Links t

**Disclaimer:** While the information provided here is based on the referenced web page, it's always recommended to verify details and seek specific guidance from official IBM documentation or the appropriate vendor (like SDS) for authoritative information.

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