Thanks Andreas and Martijn for your comments. I've incorporated them and will have the next revision available tomorrow. Where is the best place to put this document? I don't think I've got access to the zdp server. Evelyn Mitchell efm@tummy.com -- http://www.tummy.com/ Consulting and Software for Linux and Unix XVScan - Scanning software for Linux, HP-UX, Solaris, FreeBSD and BSD/OS