[Linley Meslier]

Now that you're asking I've never actually cared abou the real definitions of certificates. I know that some website require certificates for access. This is in some way to create a secure access and an authentication method. Many enterprises use certificates to give access to their networks. If such certificates are not installed on your device, access is denied. I suppose the enroller is an application to manage certificates on your device. Have you checked your user manual, HPs website or contacted HP support for more info?