https://wiki.gobolinux.org/Concepts/Understanding-and-maintaining-system-indices/index.htmlThe two main parts of GoboLinux are /Programs and /System. If you stick to using InstallPackage and Compile, these two parts will be implicitly kept in sync by SymlinkProgram. But a lot of power lies in the fact that you can tune how these two worlds interact. Program entries under /Programs feature a Current symlink pointing to a specific version that is “active” in the system. This Current version is taken as the default version when you don’t specify a version in scripts, and the link is updated when you install a new version with InstallPackage or Compile.Hugoen-us