See the PID: Your Personal IDentifier Information and Requirements knowledge page.
My VT is a gateway or portal to Virginia Tech online services and information designed to be used by all Virginia Tech students, faculty, staff, and alumni. The automatic single sign-on capability My VT offers with several university services, such as Hokie SPA, and Departmental Software, uses Central Authentication Services (CAS). Single sign-on means that once you log on to My VT, you won't have to retype your PID and password to access those online services. Featured also in My VT are several information channels that focus on a particular topic. Currently there are over 30 different channels created by various university departments and some channels are from outside sources, like headline news.