If you’d like to maintain full-time status to keep getting fellowship money after you finish your coursework, you’ll need to register for weighted instructional units.  Here’s a how-to, copied from Mike Miller’s very helpful listserve email:

• Go to the GC dynamic schedule here, and select courses for the desired term.
• Then, under “subject,” choose “Weighted Instructional Units.” That’s where you’ll find the CRNs for WIUs.
• In order to maintain your full-time status, you need to register for 7 WIUs. If, for example, you only have 3 credits left, and will be registering for one course, you’d need to register for 4 WIUs (which has a different CRN).