Lets you set various personal functions (like custom functions, but less useful
). More importantly, the camera records all kinds of things for each exposure. The software link lets you retrieve that stuff. Kind of like EXIF for digital cameras. Aperture, shutter speed, ISO, active focus point, time taken, etc. For the most part, its completely useless, but it came with the camera and I have a record of exposures if I ever really wanted them.
I think the camera stores 50-100 rolls worth of data depending on what you set it up to store.