The 'lpr' command causes Unix to make a temporary copy of the file and save it to a special directory. It then adds the print job to a print queue. Once the print job is finished, the temporary file is removed. Daemons oversee printing, process mail, manage memory, etc. It's output is to the screen unless you pipe it to a print command.
Normal usage is 'lpq -Pprintername'.
The job number is obtained with the 'lpq' command. To print a banner, enter 'banner 'banner wording''.