Help Desk SAP R3

Seeking to understand the role of the Help Desk SAP R3 support analyst – (not SAP implementation or functional analyst). I would like to know who is seeking these kinds of professionals? The SAP website does not have any information on who is taking the functional calls from the users or SAP R/3 clients post roll out. I am asking for information such as links and agencies who provide this support to better understand its role and the position salary requirements.Any discussion relative to the Helpdesk SAP R3 support analyst would be helpful.