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PTP (Picture Transfer Protocol) is the new protocol for image transfer that can be used with Windows XP (Home edition/Professional) and Mac OS X.
With conventional Mass-Storage Class, the camera was used as a card reader, and therefore, it was not possible to control the camera from a PC.
With the camera, in addition to conventional USB Mass-Storage Class, it also offers PTP-compatibility.
The PTP system will most likely become a future standard protocol and offers camera control capability from a PC, including shutter release and various settings.
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