You become the doctor in this "real-life" simulation. From the initial contact with patients to their release, you'll be processing paperwork, examining, diagnosing, ordering treatment, and performing follow-up examinations.
Things can get very hectic in the Emergency Room of Legacy Memorial Hospital. There are a wide variety of medical situations to deal with which range in seriousness from a simple bee sting to sexually transmitted diseases to "code blue" life-threatening accidents. Over 400 such cases are covered in this game.
Don't worry if you have no medical knowledge because the research materials available to you are plentiful. You'll do quite a bit of reading on medical treatments, human anatomy and physiology and emergency procedures.