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  2. User error - Wikipedia

    en.wikipedia.org/wiki/User_error

    Phrases used by the tech savvy to mean that a problem is caused entirely by the fault of the user include PEBKAC [8] (an acronym for "problem exists between keyboard and chair"), PEBCAK [9] (an alternative, but similar, acronym for "problem exists between chair and keyboard"), POBCAK (a US government/military acronym for "problem occurs between ...

  3. Model M keyboard - Wikipedia

    en.wikipedia.org/wiki/Model_M_keyboard

    Model M keyboards are a group of computer keyboards designed and manufactured by IBM starting in 1985, and later by Lexmark International, Maxi Switch, and Unicomp. The keyboard's different variations have their own distinct characteristics, with the vast majority having a buckling-spring key design and uniform profile, swappable keycaps. Model ...

  4. XM4 - Wikipedia

    en.wikipedia.org/wiki/XM4

    XM4 may refer to: XM-4 Blues, a satellite operated by XM satellite radio; XM 4, a radio channel from Sirus XM satellite radio; see List of Sirius XM Radio channels;

  5. M4 carbine - Wikipedia

    en.wikipedia.org/wiki/M4_carbine

    In June 1985, the Picatinny Arsenal was given a contract to produce 40 prototypes of the XM4. [16] Initially a joint program between the Army and Marines, in 1986 the Army withdrew their funding. The XM4 was finished in 1987, and the Marines adopted 892 for that fiscal year, with the designation "carbine, 5.56mm, M4". [16]