What is the difference between the USER and External Participant in an Experiment statuses?

Users are bound to CERN by a contract of association. In addition to a CERN computer account, they are granted access to the experiment data as well as physical access to the site.

External Participants in an Experiment are registered remotely. They are not bound to CERN by a contract of association. They are granted a CERN computer account and remote access to the experiment data, but do not have physical access to the site.