What is username in registration form?
The user name in CET Application login is generally the name through which you have created your user id on the platform.
What is a username field?
The username-field command specifies the value for the name attribute in the login form that identifies the username field. The default value of j_username follows the Java™ Platform, Enterprise Edition standard for login forms.
What is user registration system?
A registered user is a user of a website, program, or other systems who has previously registered. Registered users normally provide some sort of credentials (such as a username or e-mail address, and a password) to the system in order to prove their identity: this is known as logging in.