Why would you want to automate printing a pdf file. I can personally say the if i was looking for something and accidentally clicked on that pdf and it automatically printed and i didnt want that one, i wouldnt be happy. My personal opinion is that taking all control away from the client is not a very good idea. Let them view it and leave them the contol of whether or not they want to print it, and where they want to print it to. But this is my opinion and lack of fully understanding why you would want to do this.