The HelpDesk for a company provides an abstract way for employees to request assistance, and for the correct individual/department in the company to give them help.  For example, the IT department typically is overwhelmed with tasks and requests and interruptions -- by having employees use the HelpDesk instead of calling IT directly, the HelpDesk supervisor can route requests to the proper individual and lessen the IT requests and interruptions.

The HelpDesk section can be constructed such that employees can ask HR related questions in one area, IT questions in another, and other questions in a General form.  Providing a FAQ and a set of feedback forms can help employees ask the questions properly and send them to the correct area.