In the past, you could capture global errors in the Application_Error function of the Global.asax. But since that has been made private, and lets be honest its not best practice. Is there a way to capture that information? I don't know of anyway right now. Mvc has a pipeline for capturing errors.
When I look in Sitecore.Web.Application, I don't see Sitecore extending the Application_Error function.
Any thoughts on how to capture all errors on a Sitecore Web Forms application?