Default Printer

I am trying to have my application print directly to a default printer.
So I am using PpLoadPrinter (pc, name)

In the help viewer it says that if you do not provide a name, it will load
the default printer information into pc.

How exactly do you do this? I have tried using:
“” ; 0 ; NULL
all of these still return a -1 indicating it cannot find the default

I have also looked into my config files, and I am not sure what designates a
particular printer as the default printer.

Any help on this would be appreciated.