This version of MELTS/pMELTS is the latest software release. It was built on a Pentium III (DELL Inspiron 5000e laptop) running RedHat Linux 7.0. It should run on any Intel system with RedHat 7.x (or equivalent) installed. The execuatble is gzip-ed and may be recovered using gzip -d. This executable is dynamically linked against shared Motif, X11, and C dynamic libraries. These are all part of the RedHat distribution. Make sure you include the runtime OpenMotif rpm when you install RedHat to gain access to the shared Motif library. Correct functioning of the graphics popup window requires installation of the xMgr software package (http://plasma-gate.weizmann.ac.il/Grace/). It is not necessary to have this package installed to run MELTS. When the executable is started you will be asked a question as to which version of the software you wish to run (MELTS or pMELTS). MELTS should be used for calculations on natural liquids in the range 0-2 GPa. pMELTS should ONLY be used for peridotite bulk compositions in the range 1-3 GPa. The software will not stop you from doing otherwise, but results will not be useful if you try. The manual is online at http://www.geology.washington.edu/~ghiorso/MeltsWWW/ The Java version of this software is online at http://melts.geology.washington.edu/ -Mark Ghiorso ghiorso@u.washington.edu