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In computing, a presentation program (also called presentation software) is a software package used to display information in the form of a slide show. It has three major functions: an editor that allows text to be inserted and formatted a method for inserting and manipulating graphic images and media clips a slide-show system to display the contentPresentation software can be viewed as enabling a functionally-specific category of electronic media, with its own distinct culture and practices as compared to traditional presentation media (such as blackboards, whiteboards and flip charts). Presentations in this mode of delivery have become pervasive in many aspects of business communication, especially in business planning, as well as in academic-conference and professional conference settings, and in the knowledge economy generally, where ideas are a primary work output. Presentations may also feature prominently in political settings, especially in workplace politics, where persuasion is a central determinant of group outcomes.Most modern meeting-rooms and conference halls are configured to include presentation electronics, such as projectors suitable for displaying presentation slides, often driven by the presenter's own laptop, under direct control of the presentation program used to develop the presentation. Often a presenter will present a lecture using the slides as a visual aid both for the presenter (to track the lecture's coverage) and for the audience (especially when an audience member mishears or misunderstands the verbal component). Generally in presentations, the visual material is considered supplemental to a strong aural presentation that accompanies the slide show, but in many cases, such as statistical graphics, it can be difficult to convey essential information other than by visual means; additionally, a well-designed infographic can be extremely effective in a way that words are not. Endemic over-reliance on slides with low information density and with a poor accompanying lecture has given presentation software a negative reputation as sometimes functioning as a crutch for the poorly informed or the poorly prepared. Using Autographix and Dicomed, it became quite easy to make last-minute changes compared to traditional typesetting and pasteup. It was also a lot easier to produce a large number of slides in a small amount of time. However, these workstations also required skilled operators, and a single workstation represented an investment of $50,000 to $200,000 (in 1979 dollars). In the mid-1980s developments in the world of computers changed the way presentations were created. Inexpensive, specialized applications now made it possible for anyone with a PC to create professional-looking presentation graphics. Originally these programs were used to generate 35 mm slides, to be presented using a slide projector. As these programs became more common in the late 1980s several companies set up services that would accept the shows on diskette and create slides using a film recorder or print transparencies. In the 1990s dedicated LCD-based screens that could be placed on the projectors started to replace the transparencies, and by the early 2000s they had almost all been replaced by video projectors.The first commercial computer software specifically intended for creating WYSIWYG presentations was developed at Hewlett-Packard in 1979 and called BRUNO and later HP-Draw. The first microcomputer-based presentation software was Cromemco's Slidemaster, developed by John F. Dunn and released by Cromemco in 1981. The first software displaying a presentation on a personal computer screen was VCN ExecuVision, developed in 1982. This program allowed users to choose from a library of images to accompany the text of their presentation. Harvard Graphics was introduced for MS-DOS and Lotus Freelance Graphics was introduced for DOS and OS/2 in 1986. PowerPoint was introduced for the Macintosh computer in 1987.

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