We already know there's precious little chance of finding it through digital tracking alone.

Digital tracking has also made it a popular telescope mount used in amateur astronomy.

Both were firing their weapons now, the bullets showing up a hotter green than the body-heat readings, the digital tracking showing them almost floating across the screen.

For example, while some electronic information about the Sept. 11 terrorists has come to light via computer searches and video records, it is not known whether increased digital tracking would have helped head off the plot, since so few of the terrorists had come to the attention of the Central Intelligence Agency before the attacks.