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  2. Push-to-talk - Wikipedia

    en.wikipedia.org/wiki/Push-to-talk

    A significant advantage of PTT is the ability for a single person to reach an active talk group with a single button press; users don't need to make several telephone calls to coordinate with a group. Push-to-talk cellular calls similarly provide half-duplex communications – while one person transmits, the other(s) receive. This combines the ...

  3. Talk:Push-to-talk - Wikipedia

    en.wikipedia.org/wiki/Talk:Push-to-talk

    If "lower call costs" were the main issue, cellular carriers would hardly offer push to talk services. So ability to talk instantly to one or many people with very easy-to-understand user interaction, which is known from walkie-talkies, enables new forms of mobile communication. However, the walkie-talkie analogy breaks down fast.

  4. Push technology - Wikipedia

    en.wikipedia.org/wiki/Push_technology

    Email may also be a push system: SMTP is a push protocol (see Push e-mail). However, the last step—from mail server to desktop computer—typically uses a pull protocol like POP3 or IMAP . Modern e-mail clients make this step seem instantaneous by repeatedly polling the mail server, frequently checking it for new mail.