Patent ID: 8117609

Claim:
A computer system for generating an update data set to be sent to remote terminals, the update data set comprising operators describing differences between a first data set comprising sorted data elements and a second data set comprising sorted data elements, the computer system comprising: a memory comprising the first and the second data set, a comparator connectable to the memory for sequentially comparing the data elements in the second data set with the data elements in the first data set, the result of a first comparison controls which data element in the first data set and which data element in the second data set that will be compared in a second comparison updating a parameter in the memory after each second comparison, and initiating a selector upon detection of a data element in the second data set being identical to a data element in the first data set, the selector being connectable to the memory and to the comparator, the selector being adapted to determine operators based on the parameter stored in the memory, and storing the determined operators in the memory, wherein the computer system is configured to generate an update data set, including the determined operators describing differences between the second data set and the first data set, to be sent to the remote terminals.