# Predefined Administrative User and Group

There is a special, predefined user named `admin` that can perform any administrative action. You cannot grant or revoke any permissions to admin. You must assign a password for `admin` immediately after installation.

For more information about changing the `admin` password, see When You First Start tibemsadmin.

There is also a special group named `$admin` for system administrator users. When a user becomes a member of this group, that user receives the same permissions as the `admin` user. You cannot grant or revoke administrator permissions from any user that is a member of the `$admin` group. You should only assign the overall system administrator(s) to the `$admi`n group.

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