In the computer field, keyboard layout has not changed for decades. In a traditional keyboard layout, the buttons on the left between "tab" and "shift" on the left side of the keyboard are caps lock buttons, which are used to switch case.In chrome book, however, the button was replaced with a "search or Launcher" button, which Google now renamed "everything button.".
Google announced the name of the key on the chrome Book Community Forum, saying the new name is based on "user feedback" and can better express the function of the button. In chrome book, there is actually no special upper case lock button, and it has been changed into a separate combination of keys. Instead, the key in that location is used to trigger a search or access to the initiator. Given that most of us rarely use the capital lock key (including me, and I type / write every day), it's actually a wise choice to reassign it to a better feature.
Google said in the announcement that you will still see references to "Launcher" in the chrome operating system, but it appears to be separate from the launcher key (now "all buttons"). We also found some recent changes in chromium Gerrit, which indicate that more keyboard shortcuts may use "everything button" in the future.