The Guest Access feature allows an instructor to permit Blackboard users who are not enrolled in your course to access your it. Guest access allows students who are interested in your courses to visit the site and view your content. Instructors can limit which areas of their course guests can access via the Manage Tools feature.
Note: People who are not within the Blackboard system (student, faculty, or staff) will not be able to access your Blackboard course as a guest. If you have questions about this, please contact your Blackboard System Administrator.
From the Control Panel:
More Information
Q: If I allow guest access, will they be able to view the
course roster or send email?
A: No, the communication areas of the course are always limited
to enrolled students.