[logback-user] Multiple JVMs writing to a single log file

I had a question about multiple JVMs writing to a single logfile. I'm aware of the "prudent" setting on FileAppender and that its purpose is to allow this. But we have noticed that we are getting the expected behavior without turning prudent mode on. That is, we are seeing the output of both processes interleaved in the single file even with prudent=false. So my question is, are we just getting lucky? Is this due to the platform we're running on (Linux) and will it break on Windows? Honestly we are probably going to switch to logging to separate files per application instance, I was just curious as to why this is working and what would be different ifwe enabled prudent mode.