1. An apparatus for explicit character filtering of ambiguous key input sequences, said apparatus comprising: a processor; a keyboard configured to accept a plurality of key inputs including explicit key inputs and ambiguous key inputs; wherein responsive to receiving an explicit key input, a single, unambiguous intended character is received; wherein an ambiguous key input indicates an intended character of a plurality of potentially intended characters, but the intended character is not known; a memory coupled to said processor, wherein said memory comprises: an object database storing objects associated with sequences of key inputs; the processor further configured to receive a first sequence of key inputs comprising a plurality of characters some of which are entered by explicit key input and some of which are entered by ambiguous key input and generate, based on the first sequence of key inputs, a first set of search character sequences, wherein each character of each search character sequence of the first set of search character sequences corresponds to either an explicit key input or an ambiguous key input in the first sequence of key inputs and is selected from the plurality of intended or potentially intended characters associated with the corresponding respective explicit key input or ambiguous key input; the processor further configured to search said database, based on the first set of search character sequences, for objects to identify a first set of potential desired objects found in said database and receive a selection of a first desired object from the first set of potential desired objects found in said database.