We've just started running Sun Grid Engine on a group of RHEL4 WS Xeon based systems and it has been smooth running so far. Grant -- Grant Denkinson <gd41 at star.le.ac.uk> telephone: +44 116 2522078 Computer Systems Manager, fax: +44 116 2523311 XMM-SSC group, Department of Physics & Astronomy, University of Leicester, Leicester, LE1 7RH, England