Medicine, you mean a MD degree or equivalent thereof? In that case, upon completion of a residency, you can become a specialist in one of many fields (internal medicine, obstetrics/ gynecology, pyschiatry, ect). Afterwards, one can either do private practice, or if one is so inclined, can do research, or work for a public agency.
Taking the Arab Open University as an example, how does this organization communicate with its customers and potential customers
Not legal
The best place would be indeeds.com, but if you have a specific university in mind, then you should go to that universities website. On there site they will have something about open positions/careers.
Open Medicine was created in 2007.
Yes, the University of the Philippines Open University website is:upou.edu.ph
University of the Philippines Open University was created in 1908.
Insurance sales
The motto of University of the Philippines Open University is 'Honor and Excellence'.
Sukhothai Thammathirat Open University was created in 1978.
ignou or Indira Gandhi National Open University
Open University of Cyprus was created in 2001.
Open University in the Netherlands was created in 1984.