Patent ID: 6042006
Filing Date: 2000-03-28
Classification: G06Q,G07F

Abstract:
A system comprising a first device, a second device and communication means for communicating signals between the first and second devices,(i) wherein the first device comprises:first memory means for storing a definition signal,first generating means for generating a first signal to be communicated to the second device,first alteration means for generating a first alteration signal and for introducing an alteration into a first section of the definition signal stored in the first memory means in accordance with the first alteration signal;(ii) wherein the second device comprises:second memory means for storing the definition signal,second generating means for generating, in response to a receipt of the first signal via the communication means, a second signal to be communicated to the first device, said second signal comprising a second section of the definition signal stored in the second memory means, andsecond alteration means for generating a second alteration signal and introducing an alteration into a third section of the definition signal stored in the second memory means in accordance with the second alteration signal;(iii) wherein the first device further comprises comparison means for comparing said second section of the definition signal in the second signal originating from the second device with a corresponding section of the definition signal stored in the first memory means; and(iv) wherein the first alteration means introduces said alteration into said first section of the definition signal stored in the first memory in accordance with a comparison result output by the comparison means, and wherein the first and third sections are corresponding sections of the definition signals stored in the first and second memory means, respectively.