Why do some users have username "user########"?
71580
Change default username from "Unknown" to "User{number}"
21275
same user two login - chat username on site x shows SO user name
48745
What does this bag with a checkmark on it next to Roblox usernames mean?
12919
Why are there folders in /Users of already deleted users?
29980
What's the point of the \Users\Default profile?
125067
What is "#!' in a script file?
19693
MySQL command appends '@localhost' to username
77690
Who is the person using a SQL login?
33567
Why "?v=hash" is added to my URLs?
73204
Renaming user name
35623
Created a new user at Stack Exchange, but did not get the right username
124799
Why are some usernames on comments not a link to user profiles?
14717
Extracting usernames from the /etc/passwd file
20391
What happened to this user's rep, badges, and name?
114072
Why does my user number show up in the search box when clicking my profile information?
82467
##UserId## parameter is no longer automatically filled on Data Explorer
142868
MVC 4 SimpleMembership - Why WebSecurity.CurrentUserId -1 after login