Forum .LRN Q&A: Response to Has someone done a comparision of dotLRN with other commercial systems?

Any system that needs to identify users in a unique manner is
going to have a central users and/or parties table. I agree that
integrating with external authentication systems is a very useful
feature, but I disagree that a central users table stands in the
way of implementing such a feature.

Bottom line: there's nothing in dotLRN/OpenACS that prevents
external authentication as long as each user can be identified by
an email address (which is a small requirement to make for
someone who is online already). It's just one more feature to
implement.