There are a number of default values that can be specified for the server. These are the default printer name, the default paper tray, the default e-mail address, and the default user name. They are specified using the elements <DEFAULT_PRINTER>, <DEFAULT_TRAY>, <DEFAULT_EMAIL>, <DEFAULT_USERNAME> respectively. The values can be anything you wish.
If a job submitted to the XML Server via an instance of the XMLPrintStream class includes these values, the defaults will be overridden for that job.