[NTG-context] 2 Slides per Page

All, I've got a slide show set up with: \setuppapersize[S6][S6] \setuplayout [width=middle, top=1cm, bottom=1cm, backspace=1cm, leftmargin=0pt, rightmargin=0pt, footer=0pt, header=0pt] Then, I have material on a slide (page), followed by a \page command, material on a slide (second page), followed by a \page command, material on a slide (third page), followed by a \page command, .... Now, I would like to print my slides on US Letter, two slides the page. Page 1 should contain my first slide at the top, second at the bottom. Page 2 should contain my third slide at the top, fourth slide at the bottom. Etc, Etc, Etc, ... Can someonw show me how to do this? Thanks.