We looked at VREFs briefly in Chapter 7, Advanced Access Control and Configuration, including a small example to illustrate how Gitolite can allow or reject pushes based on which files have been modified in commits being pushed. In this chapter, we will explore VREFs in much greater detail, since this is one of the most powerful features of Gitolite. We will start small, describing the simplest use for VREFs, then move on to more complex uses.