If a new key is used every time the program replicates, each generation of the resulting gibberish can be made to look different from its predecessor.

ECONOMIST: Computer viruses: A thing of threads and patches | The

One of its directors, Professor Bob Stone, said the idea was the program would be used by groups of eight children at a time, with two taking the controls and the others making notes and discussing what to do.

BBC: News | Education | Pupils become virtual crime fighters

One of the apps is used by staff in the state's Hop Inspection Program to report any insect problems in real time, so workers can quickly respond.

WSJ: Business Tasks Bring Out Serious Side of Apps