[OS X TeX] 1/2" margins

[Alain Schremmer]

All my documents are in documentclass{book} with MyPreamble in a style 
sheet so that all documents look something like:

    \documentclass[11pt]{book}
    \usepackage{MyPreamble}
    \begin{document}
    \renewcommand …
    \renewcommand …
    \renewcommand …
    \renewcommand …
    .
    body
    .
    .
    \end{document}

with the various \renewcommands turned on/off depending on the 
particular kind of document.

For some documents, though, I would prefer the margins to be 1/2" all 
around an 8 1/2 by 11 page.

Is there a way to achieve that by renewing something?

(I don't even know how to get 1/2" margins as I got lost in Companion2ed.)

Hopeful regards
--schremmer
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