Ready to do iPhone development, the first question to ask a data access

IPhone client program is how to access the data on the backend server it? Can Web Service is similar to that? Can access WebService Windows under it?
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On the PC to browse the site without converting
iPhone can access

Not doing so bad ⋯ ⋯
to other platforms
Many IOS platform database access methods, access to the database is similar to Linux
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I have to do is a client program, like Sina Weibo IPhone ends the same. . I built a webservice in a Windows server, the client program I can not access it?
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Can access their own methods to find more
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You can read this article:
http://www.cocoachina.com/bbs/read.php?tid-16561-keyword-web% 7Cservice.html
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haha I also made out in accordance with the articles posted are late you forgive knot