what is meaning of 开发者_运维问答(iPhone SDK) iOS 4.2 in as a software requirement. please reply
It means probably that your application has to run on devices with iOS 4.2 and higher. You can set this in 'Deployment target' setting of your project.
Software Development Kit which will be having iOS4.2 as its base sdk. in short XCode 3.2.5
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