We use Active Directory and would love our users to automatically be signed in based on their signed in credentials.
Internally, where a user navigates to a site that is on our network/domain the user would automatically be signed in and be redirected to their files.
Externally they would obviously require to sign in.
Furthermore an option to Switch Users in the top right corner menu would allow a user to easily switch if they choose to. (or if they have multiple access rights)
https://www.johnthedeveloper.co.uk/single-sign-on-active-directory-php-ubuntu
Configuring Internet Explorer for Automatic Logon
Cheers,
Ivan