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  2. Comparison of instant messaging protocols - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_instant...

    Asynchronous message relaying Transport Layer Security End-to-end encryption Unlimited number of contacts Bulletins to all contacts One-to-many routing [a] Spam protection Group, channel or conference support Audio/VoIP support Webcam/Video Batch file sharing Media synchronization Serverless [b] (decentralized) Binary format Protocol

  3. 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 ...

  4. Telegram (software) - Wikipedia

    en.wikipedia.org/wiki/Telegram_(software)

    Telegram Messenger, commonly known as Telegram, is a cloud-based, cross-platform, social media and instant messaging (IM) service. It was originally launched for iOS on 14 August 2013 and Android on 20 October 2013. It allows users to exchange messages, share media and files, and hold private and group voice or video calls as well as public ...

  5. Telegraphy - Wikipedia

    en.wikipedia.org/wiki/Telegraphy

    A telegram service is a company or public entity that delivers telegraphed messages directly to the recipient. Telegram services were not inaugurated until electric telegraphy became available. Earlier optical systems were largely limited to official government and military purposes.

  6. Frequency-division multiplexing - Wikipedia

    en.wikipedia.org/wiki/Frequency-division...

    Such systems are used in DTL (Direct To Line) and DFSG (Directly formed super group). 132 voice channels (2SG + 1G) can be formed using DTL plane the modulation and frequency plan are given in FIG1 and FIG2 use of DTL technique allows the formation of a maximum of 132 voice channels that can be placed direct to line. DTL eliminates group and ...

  7. Worldwide use of telegrams by country - Wikipedia

    en.wikipedia.org/wiki/Worldwide_use_of_telegrams...

    Vivacom stopped telegram service in 2005, although Bulgarian Posts since 2006 offers "Telemail", which allows the sending of short text messages, graphic documents, and hand-written messages from any post office to a fax or teletype machine on Vivacom's network. [6] Canada: Yes – Telegrams Canada still offers telegram service.

  8. Help:Convert messages - Wikipedia

    en.wikipedia.org/wiki/Help:Convert_messages

    Template talk:Convert • Questions on using the convert template, or discussion of any problems encountered Wikipedia:Help desk • General questions Module talk:Convert • Discussion concerning the convert modules

  9. Supergroup (physics) - Wikipedia

    en.wikipedia.org/wiki/Supergroup_(physics)

    The concept of supergroup is a generalization of that of group. In other words, every supergroup carries a natural group structure, but there may be more than one way to structure a given group as a supergroup. A supergroup is like a Lie group in that there is a well defined notion of smooth function defined on them. However the functions may ...