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2. Short-range agent communications - Wikipedia

   en.wikipedia.org/wiki/Short-range_agent...

   Short range agent communications (SRAC) are one-way or two-way short-range wireless communications used for intelligence purposes. This communications technology became possible with the arrival of the transistor and small scale integrated circuits. In the late 2000s computer WiFi technology and USB Flash Drives had evolved into technologies ...

3. SMS - Wikipedia

   en.wikipedia.org/wiki/SMS

   An SMS message written on a Motorola Razr V3. Short Message Service, commonly abbreviated as SMS, is a text messaging service component of most telephone, Internet and mobile device systems. It uses standardized communication protocols that let mobile phones exchange short text messages, typically transmitted over cellular networks.

4. Text messaging - Wikipedia

   en.wikipedia.org/wiki/Text_messaging

   A text message conversation on an iPhone. Text messaging, or texting, is the act of composing and sending electronic messages, typically consisting of alphabetic and numeric characters, between two or more users of mobile phones, tablet computers, smartwatches, desktops / laptops, or another type of compatible computer.

5. Short-range device - Wikipedia

   en.wikipedia.org/wiki/Short-range_device

   A short-range device (SRD), described by ECC Recommendation 70-03, is a radio-frequency transmitter device used in telecommunication that has little capability of causing harmful interference to other radio equipment. Short-range devices are low-power transmitters, typically limited to 25–100 mW effective radiated power (ERP) or less ...

6. Electrical telegraph - Wikipedia

   en.wikipedia.org/wiki/Electrical_telegraph

   Hughes telegraph, an early (1855) teleprinter built by Siemens and Halske. Electrical telegraphy is a point-to-point text messaging system, primarily used from the 1840s until the late 20th century. It was the first electrical telecommunications system and the most widely used of a number of early messaging systems called telegraphs, that were ...

7. Near-field communication - Wikipedia

   en.wikipedia.org/wiki/Near-field_communication

   This chip is commonly found in smartphones and other NFC devices. Near-field communication (NFC) is a set of communication protocols that enables communication between two electronic devices over a distance of 4 centimetres (1.6 in) or less. [1] NFC offers a low-speed connection through a simple setup that can be used for the bootstrapping of ...