Presentation Manager (OS/2)
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| Presentation Manager (OS/2) | |
|---|---|
| Name | Presentation Manager |
| Title | Presentation Manager (OS/2) |
| Developer | International Business Machines Corporation, Microsoft Corporation |
| Released | 1988 |
| Latest release | OS/2 2.0 / OS/2 Warp (1992) |
| Operating system | OS/2 |
| Genre | Graphical user interface |
Presentation Manager (OS/2) Presentation Manager is the graphical user interface introduced for the OS/2 operating system developed jointly by International Business Machines Corporation and Microsoft Corporation and later maintained primarily by IBM. It provided a windowing environment, desktop services, and widget set for applications running on OS/2 releases including OS/2 1.x and OS/2 2.0 (Warp), and interacted with industry technologies such as Windows API, X Window System, POSIX subsystems and hardware platforms like Intel 386 and Intel 486. The project touched major industry figures and organizations including Bill Gates, Paul Allen, Ken Olsen, Andy Grove, and standards bodies such as IEEE and ISO.
History
Presentation Manager emerged from the collaboration between IBM and Microsoft in the mid-1980s during joint development of OS/2, a successor to MS-DOS and an alternative to Microsoft Windows 1.0 and Windows 2.0. Early design work involved engineers and architects influenced by interfaces such as Xerox Alto, Apple Lisa, and Macintosh System Software; competing products included Microsoft Windows, Digital Research GEM, and SunView. The 1988 release accompanied OS/2 1.0 and was refined through OS/2 1.1 and 1.2; after the Microsoft–IBM split in the late 1980s, IBM continued Presentation Manager development, integrating advances for protected-mode operation seen in Intel 80286 and Intel 80386 processors. Major events shaping its trajectory included strategic shifts by Microsoft Corporation toward Windows 3.0 and market decisions by firms such as Compaq, Hewlett-Packard, and Novell. The OS/2 2.0 (Warp) era introduced significant revisions amid competition from Windows NT, Sun Microsystems, and the emerging Linux community.
Architecture and Components
Presentation Manager was built atop OS/2’s kernel and executive layers and provided message-based windowing services, device context management, and resource handling. Core components included the Presentation Manager kernel-side hooks, the window manager, the Presentation Manager device driver model, and system libraries analogous to the Win32 API; these interfaced with OS/2 kernel subsystems similar in role to POSIX and UNIX System V components. Graphics primitives were exposed via callable APIs and integrated with printing subsystems used by Aldus PageMaker, CorelDRAW, and Adobe Illustrator ports to OS/2. The architecture accommodated hardware drivers from vendors like Intel, Cirrus Logic, ATI Technologies, and Matrox, and supported internationalization standards promulgated by ISO. Security and multitasking were influenced by research from institutions such as MIT, Bell Labs, and Carnegie Mellon University.
User Interface and Features
Presentation Manager provided desktop metaphors, windowing controls, menus, and dialog boxes with widgets comparable to those in Macintosh System Software and Microsoft Windows 3.0. It supported multiple fonts via font engines and vector rendering used by applications like IBM Lotus 1-2-3 and WordPerfect, clipboard operations that paralleled those in Microsoft Word, and drag-and-drop paradigms later echoed by Palm OS and BeOS. System utilities and bundled components included file managers, print spoolers, and control panels that integrated with enterprise applications from SAP, Oracle Corporation, and Siebel Systems. Accessibility and international language support aligned with initiatives by UN language programs and regional partners such as IBM Japan and IBM Australia.
Development and Programming Model
Application development for Presentation Manager used an event-driven, message-loop model and a procedural API exposed via header files and libraries; common toolchains included compilers and debuggers from Microsoft Visual C++, Borland C++, Watcom C and IBM’s own compilers. Developers used resource definition formats, dialog editors, and frameworks analogous to those in Microsoft Foundation Classes and later object-oriented environments such as Open Class Library and third-party toolkits from Rational Software and Rogue Wave. Interoperability with Win16 applications, DLLs, and compatibility layers influenced porting strategies employed by vendors like Lotus Development Corporation, Novell, and IBM Rochester. The programming model supported threads and asynchronous I/O consonant with contemporary work in Sun Microsystems and academic projects at Stanford University.
Relationship to Workplace Shell and OS/2 Versions
Presentation Manager served as the foundation upon which OS/2’s later desktop, the Workplace Shell, was constructed; the Workplace Shell, introduced in OS/2 2.0, layered an object-oriented desktop environment inspired by Smalltalk and the Apple Macintosh Finder. Integration work involved IBM research labs in Hursley and IBM Research – Almaden and was influenced by concepts from Xerox PARC and PARC Alto interfaces. Different OS/2 versions—OS/2 1.x, OS/2 2.0, OS/2 Warp, and subsequent releases maintained compatibility shims and evolved Presentation Manager APIs to accommodate 32-bit addressing, multimedia subsystems, and network services used by Novell NetWare, TCP/IP, and NetBIOS deployments in enterprise settings managed by organizations such as Deloitte and Accenture.
Market Impact and Legacy
Presentation Manager had a mixed commercial impact: it advanced graphical interface technology in enterprise computing, influenced competitors such as Microsoft Windows NT and Motif, and informed user-interface research at institutions like CMU and MIT Media Lab. Although OS/2 and Presentation Manager did not achieve the desktop market dominance of Microsoft Windows, they sustained significant installed bases in banking, telecoms, and government agencies relying on software from vendors including Bank of America, AT&T, Deutsche Bank, and Siemens. Legacy contributions include influence on later desktop paradigms in Linux desktop environments and cross-platform GUI toolkits developed by Qt Project and GTK+, and preservation efforts by communities like Netlabs and projects archived by Computer History Museum and Internet Archive.