Now before we continue, and we look at more details
of version control systems, I want to ask you a
quick question about VCS. I want to know whether you
have used a version control system before, and if so,
which one or which ones. I'm going to list in
here some of the most commonly used version control systems,
like CVS, Subversion, GIT, and I'm also allowing you to
specify other VCS in case you have used different ones.