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| There are 7 entries in the glossary. |
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| OCR | (Optical Character Recognition) A program which attempts to convert a scanned image (ie a picture) of text into text that can be edited in a word processor. The result is rarely 100% accurate and must be carefully proofread, but it can save a lot of retyping. |
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| OEM | (Original Equipment Manufacturer) A company that actually builds computers, as opposed to just retailing them. (OEM software) is ordinary software bought in bulk at a discount by the OEM and pre-installed on a new machines, usually without printed manuals. (OEM software) offered for sale at huge discounts in spam is almost certain to be pirated. |
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| Off-topic | A message which is not relevant to a particular newsgroup or forum on the Internet is said to be (off-topic). Posting off-topic messages in newsgroups annoys people intensely, as they make it harder to follow the discussion properly. |
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| Online | Connected to the internet. |
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| Operating System | Every computer has an operating system, which is a sort of master program that runs automatically when you switch the computer on, and continues running till you switch off. It is responsible for the many routine tasks required to keep a computer running : moving the pointer when you move the mouse, providing icons and menus, running other programs such as a word processor or a game which you may request, controlling the various disk drives, the screen and so on. The most widely used PC operating system is Microsoft Windows. |
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| OS/2 | (Operating System 2) A rival PC operating system to Microsoft Windows, produced by IBM in the 1990s. It still has a small, dedicated core of supporters, but didn\\\'t catch on and for most purposes is obsolete. |
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| Overwrite | Replace a computer file such as a document or picture with a newer version, destroying the earlier version. If you make changes to a document and save it with the same filename, the previous version is overwritten and usually cannot be restored. |
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