Twain compatible camera's operate much like twain scanners, both use twain drivers along with the software to capture the picture and import it to the pc. Just install the included twain driver, load your favorite photo editing software like MGI PhotoSuite SE or PhotoShop, and your up and running. These drivers are made for Sanyo camera's but should work on any twain/serial port camera.
For specs. on the Sanyo VPC G250 visit this page