Here is a down and dirty way to launch word, open a document, merge it with the datasource,send the resulting merged letters to the printer and close word.

public goWordApp
goWordApp = createobject("Word.Application")
goWordApp.documents.open(settlement.doc)
gowordapp.activedocument.mailmerge.destination = 1
goWordApp.ActiveDocument.MailMerge.Execute
goWordApp.documents.close(wdDoNotSaveChanges)
goWordApp.quit()
release goWordApp

Hope this helps!