Hi, I wonder if someone could point me to a definition of private headers, and their prescribed use. I refer to the headers described e.g. in RFCs 3325 & 3455. Thanks, Hume Hume Vance Director of Firmware Engineering Zoom Technologies, Inc. 207 South St. Boston, MA 02111 (617) 753-0032 (617) 542-8276 fax humev at zoom.com