29. A computer system comprising: a) a client computer interconnected to a computer network comprising a target server computer associated therewith, and b) a computer input device coupled to said client computer, adapted to read a machine readable symbol from a data carrier and transmit to said client computer an input data string; wherein said client computer comprises processing means for transposing said input data string to a plurality of constituent fields, said fields comprising at least a file location pointer; means for utilizing said file location pointer to request the computer file designated thereby; comprising means for passing said file location pointer to an application program on said client computer suitable for Processing the corresponding computer file; means for the application program to retrieve the computer file from the specified file location; means for assembling a computer file transfer request word comprising said file location pointer, and means for transmitting said computer file transfer request word to said target server computer via said network; wherein said target server computer comprises: means for receiving said computer file transfer request word; and means for transmitting a computer file to said client computer in response to said computer file transfer request word; wherein said input data string fields also comprise user demographics data correlated to a targeted user of said data carrier.
29. A computer system comprising: a) a client computer interconnected to a computer network comprising a target server computer associated therewith, and b) a computer input device coupled to said client computer, adapted to read a machine readable symbol from a data carrier and transmit to said client computer an input data string; wherein said client computer comprises processing means for transposing said input data string to a plurality of constituent fields, said fields comprising at least a file location pointer; means for utilizing said file location pointer to request the computer file designated thereby; comprising means for passing said file location pointer to an application program on said client computer suitable for Processing the corresponding computer file; means for the application program to retrieve the computer file from the specified file location; means for assembling a computer file transfer request word comprising said file location pointer, and means for transmitting said computer file transfer request word to said target server computer via said network; wherein said target server computer comprises: means for receiving said computer file transfer request word; and means for transmitting a computer file to said client computer in response to said computer file transfer request word; wherein said input data string fields also comprise user demographics data correlated to a targeted user of said data carrier. 30. The computer system of claim 29 wherein said user demographics data is included in said file transfer request word transmitted to said target computer, and wherein said target server computer comprises means for storing said user demographics data.