The Dell SonicWALL SonicOS Enhanced is the powerful SonicOS operating system for SonicWALL security appliances. It features a Single Sign-On User Authentication, which provides privileged access to multiple network resources with a single workstation login. Single Sign-On uses the SonicWALL SSO Agent to identify user activity based on workstation IP addresses. Access to resources is based on policy for the group to which the user belongs. Moreover, its Application Firewall provides a way to create application-specific policies to regulate Web browsing, file transfer, email, and email attachments.