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If you simply plugged in your desktop PC the day you got it and have since been happily using it without ever installing any additional applications, you might not see the significance of this task. More realistically, you've probably installed numerous applications on your desktop PC ranging from productivity applications to games. Your BlackBerry device is no different from your desktop PC in regard to expanding its software capabilities through third-party applications. There is a surprisingly wide range of available applications, most of them priced reasonably—and some are even available for free download.
It's worth noting that BlackBerry devices have been around for several years, and not all of them are as full-featured as the 7100 series. For this reason, you should pay close attention to any applications you consider installing to ensure that they specifically take advantage of the newer features in the 7100. Otherwise, you might end up with an application that is designed to run on a much smaller black-and-white screen. An application designed specifically for the 7100 will take advantage of the larger color screen and phone features that are built in to the device.
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Speaking of installing applications, the following are a few websites you might want to visit to find useful BlackBerry applications: http://www.handango.com/, http://www.rimroad.com/software.html, and http://www.magmic.com/.
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You can download and install an application directly to your BlackBerry device from the Web. See 50 Install a New Application Over-the-Air to find out how.