Final answer:
The 'Job Openings,' 'Vacancies,' or 'Careers' tab in an HRAR system displays the vacant positions available within a unit, listing details like job title, department, and qualifications needed.
Step-by-step explanation:
The tab within the HRAR system that displays vacant positions within a unit is typically referred to as the 'Job Openings,' 'Vacancies,' or 'Careers' tab, depending on the specific HRAR system in use. When you access this tab, you will be able to see a list of positions that are currently unoccupied and available for new applicants to apply for. The list usually provides information about the job title, department, required qualifications, and sometimes the deadline for application submission.