"Mail merges are a means of using fields to create multiple
copies of a document. They got their name because one of the most
common uses for the tool is to address letters to different
destinations. However, the same process can be used for other
purposes as well, such as personalizing a form letter. If you
choose, you even could use mail merges as a form of conditional
text. Of all the uses fields have in OpenOffice.org Writer, mail
merges is one of the most useful--and the most complicated..."