Registrars are doctors formally enrolled and accredited into a speciality (also known as 'vocational') training program; hence, they are also known as "trainee specialists". After completing internship and one or more additional years as a resident and meeting the pre-requisites for the relevant speciality college, doctors can apply for admission to a recognised medical speciality training program. Registrarship or vocational specialty training is akin to an apprenticeship or clerkship in other professions. It is a period of on-the-job training and assessments in order to qualify for fellowship of one of the recognised specialist medical colleges, which allows a doctor to practice medicine independently and unsupervised in that relevant speciality field, and with this access to an unrestricted Medicare provider number and Medical Board specialist registration.