None, unless your friend logs in. But you should have a secret password they don't know.
Default user
a mandatory A local user profile is stored on the computer to which the user logs on.
I don't think you can if the user has changed the original URL. You need a full name, email address, or screen name. However, if the person hasn't changed the URL from the profile number, just go to myspace.com/_______. (Put the profile number where the blank is.)
The user profile name identifies the user to the server. This user profile name is also known as the user ID. It is the name the user types in the User prompt on the Sign On display.
A Roaming profile is where setting established by a user at one computer are stored in a file on a file server on the network and shared with all computers in the workgroup, When a user moves from one computer to the next in the workgroup the roaming profile follows the user so that he or she does not have to redo settings at each computer. A Mandatory profile is a roaming profile that applies to all users in a user group, and individual users cannot change that profile. It is used in situations were users perform only specific job-related task.
a user profile that prevents the user from logging on if the mandatory profile is unavailable
On July 4, 2010, Answers.com changed the terminology for the "bio page" to "profile." The idea is that "profile" is a more common term for a user's information page, and pretty much a web standard. Now you can refer to your Answers.com profile when sharing your account with friends or colleagues.
Changing the user name for the ESPN account entails signing into the account and going to the profile. When in the profile, the user name can be changed. Some companies will require a change in billing information to effect the profile name change.
registry
Every user of Facebook has a profile link from which he/she is recognized. Profile link is regarded as the identity of the users.
A user with an ID does not have a profile. He is a "guest" who does not have an account on WikiAnswers.
Facebook account have unique facebook user profile and its link is created along with uniquie user id, this is facebook profile link. If user has spesified a username then the facebook profile link contains username instead of id.