An important consideration is protecting the system and its data from unauthorized access. Your SCO OpenServer system includes security mechanisms designed to meet the C2 class of ``trust'' as defined by the Trusted Computer System Evaluation Criteria (also known as the Orange Book). As the system administrator, you can configure the protection mechanisms to the requirements of your site. ``Administering user accounts'' explains how to add users to the system and how to configure the default security scheme. For additional information on protecting your system, consult ``Maintaining system security''.