1. A method performed with respect to a plurality of hand-held mobile self-powered wireless devices, a wide-area wireless communications network communicatively coupled with the plurality of mobile self-powered wireless devices, and an accounting system at a fixed location, the accounting system communicatively coupled with the wide-area wireless communications network, each mobile self-powered wireless device having a memory, a human input device, a display, and an imaging device, the memory storing a plurality of tag texts, the method comprising the steps of: by a first user at a first location, employing the imaging device of a respective first hand-held mobile self-powered wireless device to capture an image of a first document; by the first user at the first location, employing the human input device of the respective first hand-held mobile self-powered wireless device to tag the image of the first document with one of the plurality of tag texts stored in the memory of the respective first hand-held mobile self-powered wireless device and with first numerical information indicative of the first document; by the first user at the first location, causing the respective first hand-held mobile self-powered wireless device to commence transmission of the image of the first document and the tag and the first numerical information indicative of the first document through the wide-area wireless communications network to the accounting system; by the accounting system, storing the first image and the tag and the first numerical information indicative of the first document along with information indicative of an identity of the first user; by a second user at a second location differing from the first location, employing the imaging device of a respective second hand-held mobile self-powered wireless device to capture an image of a second document; by the second user at the second location, employing the human input device of the respective second hand-held mobile self-powered wireless device to tag the image of the second document with one of the plurality of tag texts stored in the memory of the respective second hand-held mobile self-powered wireless device and with second numerical information indicative of the second document; by the second user, causing the respective second hand-held mobile self-powered wireless device to commence transmission of the image of the second document and the tag and the second numerical information indicative of the second document through the wide-area wireless communications network to the accounting system; by the accounting system, storing the second image and the tag and the second numerical information indicative of the second document along with information indicative of an identity of the second user; by the first user at a third location differing from the first location and differing from the second location, employing the imaging device of the respective first hand-held mobile self-powered wireless device to capture an image of a third document; by the first user at the third location, employing the human input device of the respective first hand-held mobile self-powered wireless device to tag the image of the third document with one of the plurality of tag texts stored in the memory of the respective first hand-held mobile self-powered wireless device and with third numerical information indicative of the third document; by the first user at the third location, causing the respective first hand-held mobile self-powered wireless device to commence transmission of the image of the third document and the tag and the third numerical information indicative of the third document through the wide-area wireless communications network to the accounting system; by the accounting system, storing the third image and the tag and the third numerical information indicative of the third document along with information indicative of the identity of the first user; by the second user at a fourth location differing from the first location, differing from the second location, and differing from the third location, employing the imaging device of the respective second hand-held mobile self-powered wireless device to capture an image of a fourth document; by the second user at the fourth location, employing the human input device of the respective second hand-held mobile self-powered wireless device to tag the image of the fourth document with one of the plurality of tag texts stored in the memory of the respective second hand-held mobile self-powered wireless device and with fourth numerical information indicative of the fourth document; by the second user, causing the respective second hand-held mobile self-powered wireless device to commence transmission of the image of the fourth document and the tag and the fourth numerical information indicative of the fourth document through the wide-area wireless communications network to the accounting system; by the accounting system, storing the fourth image and the tag and the fourth numerical information indicative of the fourth document along with information indicative of the identity of the second user; by the accounting system, causing a first new and different tag text to be communicated wirelessly to the first hand-held mobile self-powered wireless device; by the accounting system, causing a second new and different tag text to be communicated wirelessly to the second hand-held mobile self-powered wireless device; by the first user at a fifth location differing from the first location, differing from the second location, differing from the third location, and differing from the fourth location, employing the imaging device of the respective first hand-held mobile self-powered wireless device to capture an image of a fifth document; by the first user at the fifth location, employing the human input device of the respective first hand-held mobile self-powered wireless device to tag the image of the fifth document with the first new and different tag text stored in the memory of the respective first hand-held mobile self-powered wireless device and with fifth numerical information indicative of the fifth document; by the first user at the fifth location, causing the respective first hand-held mobile self-powered wireless device to commence transmission of the image of the fifth document and the tag and the fifth numerical information indicative of the fifth document through the wide-area wireless communications network to the accounting system; by the accounting system, storing the fifth image and the tag and the fifth numerical information indicative of the fifth document along with information indicative of the identity of the first user; by the second user at a sixth location differing from the first location, differing from the second location, differing from the third location, differing from the fourth location, and differing from the fifth location, employing the imaging device of the respective second hand-held mobile self-powered wireless device to capture an image of a sixth document; by the second user at the sixth location, employing the human input device of the respective second hand-held mobile self-powered wireless device to tag the image of the sixth document with the second new and different text tag stored in the memory of the respective second hand-held mobile self-powered wireless device and with sixth numerical information indicative of the sixth document; by the second user at the sixth location, causing the respective second hand-held mobile self-powered wireless device to commence transmission of the image of the sixth document and the tag and the sixth numerical information indicative of the sixth document through the wide-area wireless communications network to the accounting system; by the accounting system, storing the sixth image and the tag and the sixth numerical information indicative of the sixth document along with information indicative of the identity of the second user.