The package 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.

The author is Rowland McDonnell. The package is Copyright © 1995-1997 R.J.M. McDonnell.