This is available on helpdesk/doc

The source code itself should be rapidly available on drupal

Preliminary design info is available on FGM's blog

Content-oriented classes share similar methods:

• init() initializes an already created instance of the class with values passed as parameters, or derives from them. It is to be used when the constructor doesn't have all information available at the time of creation and the properties must be initialized later on
• form() implements the portion of hook_form the class is responsible for
• view() implements the portion of hook_view the class is responsible for

These are:

helpdeskObject
  helpdeskContract
  helpdeskEvent
    helpdeskTicket
      helpdeskFollowup
  helpdeskTimeInfo