How can I get/set default printers on a per-user basis in Terminal Services with C#?

Question

I want to be able to get and set the default printer for users within Windows Terminal Services, but I don't see any relevant functions. (The closest I've seen is RDS User Config, but it doesn't appear to do what I need.) It can be done by name or by ID (however necessary). For example, something like this pseudocode:

For each user, u:
   p = u.GetDefaultPrinter()
   if p.name=='Inkjet' then:
      p2 = GetPrinterByName('Laser')
      u.SetDefaultPrinter( p2 )