[Mac OS X TeX] landscape mode

[Paolo Ghirardato]

Guys:
I am sorry to be wasting your disk space with something that has -- I 
believe -- been discussed before, but as usual I realized a problem 
only when I faced it.

The question is this: I have a slide document that starts

\documentclass[landscape]{slides}

However, when I typeset it with TeXShop (and iTeXMac, for that 
matter), the final output is vertical, with the obvious cropping of 
long equations, etc.
I tried changing the page setup (within the program) and typesetting 
again, but unsurprisingly that changed nothing. I tried looking at 
the pdf file with Acrobat, again to find vertical slides.

Can anyone remind me how to fix this?
Thanks!
paolo

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