So, you mean after users successfully process the payment over paypal, system will instruct user's printer to do the printing order without any printer dialog on user's system? This could be implemented by using Paypal API for handling paypal process to automatically know if transaction success or canceled. And the ASP.NET would generate the VBScript for instructing browser to print the page content (order information). It means user should use Internet Explorer as it is about VBScript. Other browser cannot.