Use an alternate name when you want to use your native language and character set for name display and lookup purposes such as when sending mail.
The ability to change the default display name is available only if your administrator has enabled this feature. Before you can use an alternate for your name, your administrator must assign two names to you, a primary name and alternate name.
An alternate name is a fully authenticated name, unlike an alias which is not fully authenticated.
Your primary name and alternate name must be added to your user ID.
You can have only one alternate name.