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  2. Call blocking - Wikipedia

    en.wikipedia.org/wiki/Call_blocking

    [1] [2] Such devices and services enable the user to block a call as it is in progress or alternatively block the number after the call is made. These devices rely on caller ID information and thus a phone blocker requires a caller ID service active on the line for blocking to function. Treatment of blocked calls may include: Sending the caller ...

  3. Mobile phone jammer - Wikipedia

    en.wikipedia.org/wiki/Mobile_phone_jammer

    Example of a mobile phone jammer, produced by Jammerspro. A mobile phone jammer or blocker is a device which deliberately transmits signals on the same radio frequencies as mobile phones, disrupting the communication between the phone and the cell-phone base station, effectively disabling mobile phones within the range of the jammer, preventing them from receiving signals and from transmitting ...

  4. The Sentinel (video game) - Wikipedia

    en.wikipedia.org/wiki/The_Sentinel_(video_game)

    The Sentinel, released in the United States as The Sentry, is a puzzle video game created by Geoff Crammond, published by Firebird in 1986 for the BBC Micro and converted to the Commodore 64 (by Crammond himself), Amstrad CPC (with a cross-compiler written by Crammond), ZX Spectrum (by Mike Follin), Atari ST, Amiga (both by Steve Bak) and IBM PC compatibles (by Mark Roll).

  5. AOL Mail

    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  6. User guide - Wikipedia

    en.wikipedia.org/wiki/User_guide

    This was a unique problem for software developers, since users often became frustrated with current help documents. [2] Some considerations for writing a user guide that developed at this time include: the use of plain language [2] length and reading difficulty [2] the role of printed user guides for digital programs [3] user-centered design [3]

  7. Remote keyless system - Wikipedia

    en.wikipedia.org/wiki/Remote_keyless_system

    The device transmits a jamming signal to block the vehicle's reception of rolling code signals from the owner's fob, while recording these signals from both of his two attempts needed to unlock the vehicle. The recorded first code is sent to the vehicle only when the owner makes the second attempt, while the recorded second code is retained for ...

  8. Countersign (military) - Wikipedia

    en.wikipedia.org/wiki/Countersign_(military)

    In military terminology, a countersign is a sign, word, or any other signal previously agreed upon and required to be exchanged between a picket or guard and anybody approaching his or her post.

  9. Guardhouse - Wikipedia

    en.wikipedia.org/wiki/Guardhouse

    When sentries are relieved by their replacements, the sentry stationed at the Guardhouse, designated "No. 1", is conventionally relieved first. [ 5 ] [ 6 ] Modern guardhouses are manufactured with welded, galvanized steel construction, insulated, include heat and light, have 360 degree visibility, and can also be bullet resistant.

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