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  2. WhatsApp - Wikipedia

    en.wikipedia.org/wiki/WhatsApp

    WhatsApp Web's user interface is based on the default Android one and can be accessed through web.whatsapp.com. Access is granted after the users scan their personal QR code through their mobile WhatsApp application. There are similar solutions for macOS, such as the open-source ChitChat, previously known as WhatsMac.

  3. QR code - Wikipedia

    en.wikipedia.org/wiki/QR_code

    Whereas a barcode is a machine-readable optical image that contains information specific to the labelled item, the QR code contains the data for a locator, an identifier, and for web-tracking. To efficiently store data, QR codes use four standardized modes of encoding: (i) numeric, (ii) alphanumeric, (iii) byte or binary, and (iv) kanji . [4]

  4. List of URI schemes - Wikipedia

    en.wikipedia.org/wiki/List_of_URI_schemes

    Unofficial but common URI schemes. URL scheme in the GNOME desktop environment to access file (s) with administrative permissions with GUI applications in a safer way, instead of the insecure-considered sudo, gksu & gksudo . URL scheme can be used by packaged applications to obtain resources that are inside a container.

  5. Add or disable 2-step verification for extra security - AOL Help

    help.aol.com/articles/2-step-verification...

    6. Scan the QR code using your authenticator app. 7. Click Continue. 8. Enter the code shown in your authenticator app. 9. Click Done. Sign in with 2-step for authenticator app. 1. Sign in to your AOL account with your password. 2. Enter the verification code shown in your authenticator app. 3. Click Verify.

  6. Barcode - Wikipedia

    en.wikipedia.org/wiki/Barcode

    A barcode or bar code is a method of representing data in a visual, machine-readable form. Initially, barcodes represented data by varying the widths, spacings and sizes of parallel lines. These barcodes, now commonly referred to as linear or one-dimensional (1D), can be scanned by special optical scanners, called barcode readers, of which ...

  7. Barcode reader - Wikipedia

    en.wikipedia.org/wiki/Barcode_reader

    Barcode reader. A stationary barcode scanner for a conveyor line. A barcode reader or barcode scanner is an optical scanner that can read printed barcodes and send the data they contain to computer. [1] Like a flatbed scanner, it consists of a light source, a lens, and a light sensor for translating optical impulses into electrical signals.

  8. Reception and criticism of WhatsApp security and privacy ...

    en.wikipedia.org/wiki/Reception_and_criticism_of...

    WhatsApp launches WhatsApp Web, a web client which can be used through a web browser by syncing with the mobile device's connection. Jan 21, 2015: WhatsApp announces its policy on cracking down on 3rd-party clients, including WhatsApp+. Users would not be able to use WhatsApp’s services at all until the third-party apps are uninstalled.

  9. Universal Product Code - Wikipedia

    en.wikipedia.org/wiki/Universal_Product_Code

    A UPC barcode. The Universal Product Code (UPC or UPC code) is a barcode symbology that is used worldwide for tracking trade items in stores.. The chosen symbology has bars (or spaces) of exactly 1, 2, 3, or 4 units wide each; each decimal digit to be encoded consists of two bars and two spaces chosen to have a total width of 7 units, in both an "even" and an "odd" parity form, which enables ...