To operate ST-RISK™, you must be running Windows XP, Windows Vista, or Windows 7. ST-RISK™ requires 300 mb of disk space. During typical use, ST-RISK™ requires access to the internet for authentication, authorization, and downloading of regional data. This access is via the standard SSL port 443. This access can be through an standard authenticating proxy server if necessary. Offline authentication and authorization is supported for users who are unable to appropriately configure their organization firewall to allow the ST-RISK™ executable to access the internet. Please note: Offline authorization is much less convenient for the user than online authorization.