If you plan to print Orders directly from within PDAdmin (the Order Summary for example), you may not want the URL of the PDAdmin script to appear on the page.  By default, it does.  To disable this, you can simply change the Header & Footer options in Internet Explorer.  While in IE, click on File > Page Setup, and locate the Header & Footer fields.  You may see text such as:

"&w&bPage &p of &P" or "&u&b&d"

Simply remove the parameters you wish to hide when printing, then click "OK" to save the changes.  Next time you print a web page (an order for example) the URL to the actual page will not appear.