The default guest account in Windows 10 is completely disabled and cannot be turned on. Here’s how you can create your own guest user account in Windows 10.
If you want to allow a family member or friend to use your computer, without having to log into your account, here’s how to create a guest account for them.
The “Guest Session” mode in Ubuntu is useful only if you are planning to share your computer with other users. If you want to get rid of the “Guest Session” option in the login screen, here is how you can disable Guest Account in Ubuntu.
The guest account in Mountain Lion is there as a safety precaution in case you ever lose your Mac, but if you are adamant about removing it, here is how you can do so.