If you've already created the document, use "2 pages per sheet" in the Print
dialog. If you're just starting, use "2 pages per sheet" under "Multiple
pages" on the Margins tab of Page Setup and create the page twice at half
size. You can either create page 1 and copy/paste to page 2 or just print
pages 1, 1.
If you're trying to create a booklet, see
http://word.mvps.org/FAQs/Formatting/BookletPrinting.htm, as there are
built-in ways to do this as well.
--
Suzanne S. Barnhill
Microsoft MVP (Word)
Words into Type
Fairhope, Alabama USA
http://word.mvps.org