It lets you change page layout parameters in small steps
over a range of values using options. It can set \textwidth
appropriately for the main fount, and ensure that the text fits
inside the printable area of a printer. An rmpage-formatted
document can be typeset identically without rmpage after
a single cut and paste operation. Local configuration can
set defaults: for all documents; and by class, by printer,
and by paper size. The geometry
package is better if you want to set page layout parameters
to particular measurements.
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