As an administrator it would be helpful to have the option to "log on as" a student or instructor so see what they are seeing at that time.  Many students will say they see an error message but can't explain exactly what they're seeing. The log on as function will allow me to better understand exactly what they are seeing when they login without having to change their password, login as them, and then notify them that their password has been changed and will need to be reset to whatever they want it to be.