当用户通过表单身份验证自动登录时，如何设置会话变量？

I'm using Forms Authentication (and the built in Login controls) and letting users click the "remember me" checkbox when logging in. When they return to the site, they are automatically logged in as expected. Is there an event I can catch when this happens? I've been studying the FormsAuthenticationModule.Authenticate event, but I'm not sure that is the correct approach.I'm using Forms Authentication (and the built i