To check available courses, please check the online course listing . The default for the 'Availability' is "Open sections", which means courses that are available. If you change the default for the 'Availability' to "All Sections", this means you wish to view all courses, both available and unavailable (closed). Once you hit the 'Search' button, you will see several columns in the 'Course Listing Summary' web page. The first number in the column titled "Seats Open/Enrl" indicates how many students are still able to enroll in the section.