Update (May 2019): CAS is being phased out and will be replaced by Active Directory Federation Service (ADFS) authentication.
CAS (Central Authentication Service) is a web-based authentication appliance that is meant to provide a single sign-on solution for UW web sites and applications. CAS accepts your !WatIAM credentials and authenticates you against UW's Active Directory, whereupon CAS informs the calling application of your identity. At no time are your userid and password accessible to the calling application. We recommend you use CAS in all instances where you must authenticate UW community members in order for them to access your web site or application. The following documentation will instruct you on how to configure your particular web environment to make use of CAS.
Cookies must be enabled in your browser for CAS to function properly.