9. Apparatus as set forth in claim 7 wherein said processing means includes means for managing, within said memory, a stack having a plurality of entries, each of said entries including information for specifying a node of said vocabulary model, information for identifying a row and a column location within said two dimensional array, and a normalized probability that a letter string associated with the node represents at least a part of the word written by the writer.
9. Apparatus as set forth in claim 7 wherein said processing means includes means for managing, within said memory, a stack having a plurality of entries, each of said entries including information for specifying a node of said vocabulary model, information for identifying a row and a column location within said two dimensional array, and a normalized probability that a letter string associated with the node represents at least a part of the word written by the writer. 10. Apparatus as set forth in claim 9 wherein said memory further includes a hash table having a plurality of entries, each of said hash table entries including information for representing the normalized probability stored within an entry of said stack, and where said processing means further includes means for generating an index into said hash table in accordance with information that specifies a node of said vocabulary model and information that identifies a row and a column location within said two dimensional array.