By default a domain joined machine will ask you to enter Control-Alt-Delete before you can select a user with which to logon to the machine.
This isn't necessary and can be an inconvenience (although it does present a more secure screen from which to start logon). How do you disable this?
Optionally, you can define this via a GPO
disable the policy: Disable CTRL+ALT+DEL requirement for logon
Just thought I'd mention that it's trivial to steal a user's password with a look-alike login screen if you disable ctrl+alt+delete.
Only disable it if all the people with access to the computer are trustworthy (or everyone logs off when they leave every time with no exceptions).