System Variables for logon.failed.inc

Hello everyone.. We are using a custom logon.failed.inc page in our environment, which works well for us. The one thing that I would like to improve on is a more descriptive error message when a logon had failed. We use RSA SecurID and domain logon, so it would be good to be able to provide the user details on which authentication has failed. Does anyone know what sort of system variables can be accessed from the logon.failed.inc page? I saw in the help files that there are some system variables for the exception.inc page such as %F5_MSG%, but these don't seem to work in the logon.failed.inc. Thanks in advance ps.. We are running v 6.0.3