Authentic Instance help message at 20:27:21 on Tue Mar 24 1992
From: Marc Horowitz <marc> on STEVE-DALLAS.MIT.EDU
To: *
\def\newmargins#1#2{\begin{list}{\leftmargin=#1\rightmargin=#2}\item}
then do
\begin{newmargins}{1in}{1in}
text...
text...
\end{newmargins}
I think that will do it.
what is it that you're writing which is 100 pages?