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Chapter 1. Building iPhone and iPod touc... > Interacting with Other Applications
1.7. Interacting with Other Applications
The iPhone operating system allows for applications to call each other and start up an instance of the application. This feature is provided by the NSUrl() method.
1.7.1. UIPicker
Given that there is a limited set of schemes and protocols that are supported in an iPhone, it makes sense to present a limited set of data to the user for selection. For those familiar with the Windows operating system and .NET, some type of dropdown list control would be used. The iPhone operating system does not contain a control that looks like that control. The closest control is the UIPicker control, which is shown in Figure 15.
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