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Why did we remove Bluetooth DUN? - Microsoft explains April 18, 2007 [General] | By Edward J. R. Employees of Windows Mobile division must be extremely arrogant because they remove features (example from the past: ActiveSync over Wi-Fi) without regard to real needs of users. While introduction of Internet connection sharing over Bluetooth is welcome extension the removal of Bluetooth DUN profile angered several people who used to initiate connections from their notebooks... Internet [Connection] Sharing In WM5 AKU3 we introduced a new application called “Internet Sharing”. The technology behind this is actually referred to as Internet Connection Sharing (ICS). But our usability folks decided to drop the word “Connection” since it didn’t fit nicely in the user interface. ICS is something we’ve shipped as a component in the Windows CE operating system for several releases. We have now brought this technology to Windows Mobile. ICS allows you to share a public network connection (cellular data) with a private network connection (Bluetooth PAN or USB). The phone is basically acting like a your home’s wireless router. Modem Link Before Internet Sharing, we shipped an application called Modem Link. This application enables some of the same functionality provided by ICS. Modem Link supported sharing the cellular data connection over USB, IrDA, or Bluetooth. For Bluetooth, the DUN profile was used. Instead of sharing the Internet connection at the IP layer, as ICS does, Modem Link enables the PC to directly send commands to the cellular radio on the device. To read more click here.
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