Applying for a 3GS iPhone sync from different computers?

I currently use iTunes for my sister and I'm not sure how manually manage my songs, videos and all.I have a jailbroken iPhone and I tried to sync transfer downloaded application I just downloaded from the PC, but not work.Can someone tell me how? I do not want to erase these common applications like My iphone.I synchronize everything download and save all your current files.

You only need PC Suite is a powerful sound synchronization application, you can download free here http://download.pandaapp.com/?app=soft&controller=iphone and this free software only

MANUAL do “”iPHONE”" – Saiba como usar o seu

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