I use Facebook chat which is a form of IM (instant messaging) it enables me to have a private chat with a person as if i was there face to face with them, thats how quick the process is, but they need to be online otherwise it will be classed as a SMS (short message system)
I have done a bit of conferencing at work recently when i done a audio/video conference the video tapped the screen as i spoke about a presentation. it was then uploaded to Youtube as a way of sharing the information.
Many devices use 3G for example wireless handheld devices such as mobile phones, iPads, iPods.. use it to connect to the internet and allow you to search the web. Bluetooth devices such as webcams, laptops, mobile phones, headsets all use that connection to other pieces of hardware, or send files. Xbox live is a good example of bluetooth connectivity, if you have a wireless controller the bluetooth has to connect the controller to the correct Xbox, when that is done if your on Xbox live bluetooth allows you to talk to others with a mic having a full on conversation while playing together online.
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