slow keys must die. now

[Ahau @porteus.org]

Try googling:

bugs.debian.org/cgi-bin/bugreport.cgi?bug=657969

https://bbs.archlinux.org/viewtopic.php?id=142721

https://bugzilla.redhat.com/show_bug.cgi?id=816764

It seems most likely that this is an issue with gdm or your core x
server, rather than xfce.  If settings -> accessibility doesn't work
and you have xkbset installed, this seems to be the easiest way to
turn this off: 'xkbset -a'.  Hard to know if you have this installed,
though, as you never said what distro you are running or what version
of xfce.

Are you seriously a professor?  I'm glad I never had to take one of
your classes.  It's pretty closed minded to assume that there aren't
enough people with disabilities to warrant accomodating them with
world-wide free software.  AFAIK pretty much every distro can be set
up to log directly into a gui without typing a username and password.