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GPhoto2-Port Overview
GPhoto2-Port is the GPhoto2 I/O library.
The benefit to using this library would be that all communications can be done quickly and without worry for device specific functions; all devices are abstracted to a point, allowing you to read/write to a device using the same interface. For example, you can set all the options on the serial port easily, and then read/write to that device. Additionally, you could easily switch over to a USB device, and read/write without having to learn the USB internals.
The whole idea behind this is simplicity. It should be easy to write a program that uses any sort of serial-based device. This will take the hassle out of playing with low-level configurations and actually just get on to writing the core of the application.