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  2. Comparison of cross-platform instant messaging clients

    en.wikipedia.org/wiki/Comparison_of_cross...

    Examples of such messaging services include: Skype, Facebook Messenger, Google Hangouts (subsequently Google Chat), Telegram, ICQ, Element, Slack, Discord, etc. Users have more options as usernames or email addresses can be used as user identifiers, besides phone numbers. Unlike the phone-based model, user accounts on a multi-device model are ...

  3. visionOS - Wikipedia

    en.wikipedia.org/wiki/VisionOS

    visionOS is a mixed reality operating system derived primarily from iPadOS and its core frameworks (including UIKit, SwiftUI, ARKit and RealityKit), and MR-specific frameworks for foveated rendering and real-time interaction.

  4. Ultra Stereo - Wikipedia

    en.wikipedia.org/wiki/Ultra_Stereo

    Ultra Stereo is a cinema sound system that was developed in 1984 [1] by chief engineer Jack Cashin. It was a 4/2/4 photographic sound encoding and decoding procedure compatible with (and using the same technical basic structure, with identical sound quality as) its competitor Dolby Stereo Matrix .