When you are ready to switch and make the new boot environment active, you simply activate the new boot environment and reboot. Activating the new boot environment modifies it to make it bootable. Files are synchronized between boot environments the first time you boot a newly created boot environment. "Synchronize" here means that certain system files and directories are copied from the last-active boot environment to the boot environment being booted. When you reboot the system, the configuration that you installed on the new boot environment is active. The original boot environment then becomes an inactive boot environment. Figure 30-6 shows a switch after a reboot from an inactive to an active boot environment. For procedures on activating a boot environment, see "Activating a Boot Environment".