Just wanted to know if this is the same as "exit" or does it have a different behaviour?

Will it be added to help, or perhaps even deprecated?

Its a deprecated function. According to the source it does nothing and gives a warning to remove from code. It doesn't really tell what it was but it did something that the ide now does. Maybe it set break points or something. Just guessing never even knew of the function.

Thanks for that. Found it in some old code of mine, so I guess it was used once.

break was probably used in SELECT statements