Roy Doppelt, a California estate planning lawyer, wrote an article on HIPAA and Advanced Health Car Directives. Much of his information applies to Florida Advanced Health Care directives. Roy states that an Advance Health Care Directive appoints a family member or friend to make health care decisions for you if you become physically or mentally unable to make them for yourself.
The person appointed is your Agent and many people appoint backup agents to help make decisions. We typically draft these documents in conjunction with a living will and a HIPAA release so that your Agent cannot show one document without the other in an attempt to avoid your desires.