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

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

    Use 2-step with authenticator app verification. Authenticator apps provide secure verification codes that act as the second step in 2-step verification. After entering your password, you'll need to enter the code generated by your authenticator app to sign in. Download an authenticator app from the Google Play Store or App Store.

  3. QR code - Wikipedia

    en.wikipedia.org/wiki/QR_Code

    Accessible QR is a type of QR code that combines a standard QR code with a dot-dash pattern positioned around one corner of the code to provide product information for people who are blind and partially sighted. The codes, announce product categories and product details such as instructions, ingredients, safety warnings, and recycling information.

  4. Halt and Catch Fire (computing) - Wikipedia

    en.wikipedia.org/wiki/Halt_and_Catch_Fire...

    Halt and Catch Fire (computing) In computer engineering, Halt and Catch Fire, known by the assembly language mnemonic HCF, is an idiom referring to a computer machine code instruction that causes the computer's central processing unit (CPU) to cease meaningful operation, typically requiring a restart of the computer.

  5. Peer instruction - Wikipedia

    en.wikipedia.org/wiki/Peer_instruction

    Peer instruction is an evidence-based, interactive teaching method popularized by Harvard Professor Eric Mazur in the early 1990s. [ 1 ] [ 2 ] Originally used in many schools, including introductory undergraduate physics classes at Harvard University , peer instruction is used in various disciplines and institutions around the globe.

  6. Opcode - Wikipedia

    en.wikipedia.org/wiki/Opcode

    In computing, an opcode[1][2] (abbreviated from operation code, [1] also known as instruction machine code, [3] instruction code, [4] instruction syllable, [5][6][7][8] instruction parcel or opstring[9][2]) is the portion of a machine language instruction that specifies the operation to be performed. Beside the opcode itself, most instructions ...

  7. Barcode - Wikipedia

    en.wikipedia.org/wiki/Barcode

    Defunct as of 2019, replaced by standard QR codes. Micro QR code: Micro QR code is a smaller version of the QR code standard for applications where symbol size is limited. Micro PDF417: MicroPDF417 is a restricted size barcode, similar to PDF417, which is used to add additional data to linear barcodes. MMCC

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