The Wii U's built-in Wii emulator (often nicknamed vWii or Wii Mode) is capable of running Wii homebrew, such as The Homebrew Channel. However, vWii is much more fragile than a classic Wii console and has a higher chance of being rendered inoperable if dangerous software is used. Also, due to changes in the Wii operating system only found in vWii mode, previous exploits that utilized the HOME menu itself to load the HackMii Installer, such as Letterbomb, do not work on vWii. However, exploits that launch the HackMii Installer via a game still work on vWii. The only way to hack vWii without one of the exploit games is using an application called wuphax. Wuphax uses the public Wii U IOSU exploit to temporarily inject the HackMii installer into the Mii Channel so that The Homebrew Channel can be installed without an exploit game.