Devices that can boot a computer are usually boot disks or boot drives (normally a hard drive or Solid State Drive, but can be a floppy disk, flash drive or a CD). Some network computers use "boot chips" that get the operating system over a network. Web phones also use such chips to identify the user to the mobile phone network. Boot card standards may let many users boot kiosk computers with full privacy and access to all application software they own. There are also boot boards or boot "add-in" cards that are more permanent than boot cards.