Can I use 1 computer for Iphone

I have 1 iphone and 1 ipoh. Can I use itune separately in 1 computer or can I install 1 itune in my external hard disk for using Ipoh?
Thanks
Wong

To update your phone requires using the latest version of iTunes, on your computer, as well as Internet access. The update to iOS 5.0 or higher is an erase/restore deal, so you not only have to make sure all of the content, currently on your phone, is on your computer and accessible, you need to update iTunes first, have Internet access, then update your phone. There is no way around this fact. You could go to an Apple store or use another computer, but you run the risk of losing all of your data it you do that.

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