20. The system of claim 14 , wherein the index values and the query index value are numeric.
14. A computer-implemented system comprising: a hand-held electronic device comprising: an input interface; memory storing an index comprising index values indexing entries in a dataset, wherein the index values represent at least some of the alphanumeric content of the entries in the dataset in accordance with a conversion procedure; a processor to receive data characterizing input received over the input interface and to compute, using the conversion procedure, a query index value that represents the data; a request module to identify dataset entries represented by a first of the index values, the first index value matching the query index value; a response generator to obtain information from identified dataset entries represented by the first index value; and a display interface to cause display of the obtained information from the identified dataset entries.