This context command is used to stop execution of repeat structures (repeat N times, while true, do while) and multiple choice. It can only be used in these contexts, any other use is invalid.
The example above perform an iteration of i from 0 to n-1, if n is bigger then 5, the the command stop will be executed when i has value 5. In this case, when the variable i has the value 5, the message I found the value 5. Stop! will be printed and the loop repeat while is interrupted.