10
votes
2answers
234 views

Why would one limit username format?

Many websites when ask you to create a new "username", will limit you in some way, most often like "username should only contain letters and underscores" or something alike. This results in inability ...
43
votes
17answers
6k views

Computer login with password only, without username

I have an idea to simplify the login screen on things like home computers with a small number of users (say, 2-10) with passwords. Today, a typical home computer's login screen has three steps: ...