Headers, footers, titles and the water mark (see section 3.1.5 Headings Options),
in general to print the name of file, page number etc. On a new sheet
a2ps first draws the water mark, then the content of the first page,
then the frame of the first page, (ditto with the others), and finally
the sheet header and footers. This order must be taken into account for
some escapes (e.g., `$l.', `$l^').
To specify the generic name of the file to produce, or how to access a
printer (see section 4.5 Your Printers).