Converting Word document to PDF in 2010

I have a developer who states he can convert a Word document to PDF using the Convert Document feature on his VM.But Word Automation Services does not convert Word docs to PDF OOTB. It does with code, but we currently do not have such code in our environment. According to the Nintex Workflow 2010 User Manual: "We only support the conversions supported by Word Services."

Is there such code running behind the scenes within the Convert Document workflow item? And if so, would it be possible to see it?

 Thanks.