32. An input device operated by a single hand and used to transmit information between the operator of said device and an electronic apparatus in communication with said device, comprising: a housing; a first key array having a plurality of input means mounted to said housing and operable by the thumb of the hand; a second key array having a plurality of input means mounted to said housing, said second array aligned along a path substantially parallel to a longitudinal axis of an extended first finger of the hand such that the second key array is operable by said first finger when the thumb of the hand is operably positioned proximal to said first array; a third key array having a plurality of input means mounted to said housing, said third array aligned along a path which is substantially parallel to a longitudinal axis of an extended second finger of the hand such that the third array is operable by the second finger when the thumb and first finger are operably positioned proximal to said first and second arrays, respectively; a fourth key array having a plurality of input means mounted to said housing, said third array aligned along a path substantially parallel to a longitudinal axis of an extended third finger of the hand such that the fourth key array is operable by the third finger when the thumb, first finger and second finger are operably positioned proximal to said first, second and third arrays, respectively; a fifth key array having a plurality of input means mounted to said housing, said fifth array aligned along a path substantially parallel to the longitudinal axis of an extended fourth finger such that said fifth key array is operable by the fourth finger when the thumb, first finger, second finger and third finger of the hand are operably positioned proximal to said first, second, third and fourth arrays, respectively, wherein said first and said fifth key arrays are configured to be mutually interchangeable, said housing being arranged to receive said mutually interchangeable first and fifth key arrays in either configuration, permitting said input device to be operable alternately by the left and the right hand, and the input means of said second, third, fourth and fifth arrays including single key stroke input keys which permit the entry of a single character by the activation of one of said keys providing a spacing between said key arrays maximized at the positions corresponding to the maximum extension of corresponding finger.
32. An input device operated by a single hand and used to transmit information between the operator of said device and an electronic apparatus in communication with said device, comprising: a housing; a first key array having a plurality of input means mounted to said housing and operable by the thumb of the hand; a second key array having a plurality of input means mounted to said housing, said second array aligned along a path substantially parallel to a longitudinal axis of an extended first finger of the hand such that the second key array is operable by said first finger when the thumb of the hand is operably positioned proximal to said first array; a third key array having a plurality of input means mounted to said housing, said third array aligned along a path which is substantially parallel to a longitudinal axis of an extended second finger of the hand such that the third array is operable by the second finger when the thumb and first finger are operably positioned proximal to said first and second arrays, respectively; a fourth key array having a plurality of input means mounted to said housing, said third array aligned along a path substantially parallel to a longitudinal axis of an extended third finger of the hand such that the fourth key array is operable by the third finger when the thumb, first finger and second finger are operably positioned proximal to said first, second and third arrays, respectively; a fifth key array having a plurality of input means mounted to said housing, said fifth array aligned along a path substantially parallel to the longitudinal axis of an extended fourth finger such that said fifth key array is operable by the fourth finger when the thumb, first finger, second finger and third finger of the hand are operably positioned proximal to said first, second, third and fourth arrays, respectively, wherein said first and said fifth key arrays are configured to be mutually interchangeable, said housing being arranged to receive said mutually interchangeable first and fifth key arrays in either configuration, permitting said input device to be operable alternately by the left and the right hand, and the input means of said second, third, fourth and fifth arrays including single key stroke input keys which permit the entry of a single character by the activation of one of said keys providing a spacing between said key arrays maximized at the positions corresponding to the maximum extension of corresponding finger. 33. The input device according to claim 32, wherein said device includes a plurality of label means each disposed in close association with a corresponding key, said label means being viewable while the fingers are in contact with said corresponding key.