>From National Semiconductors website (http://www.national.com/appinfo/amps/0,2175,308,00.html) "Selguide is a software tool designed to guide the user in selecting our Operational Amplifier, Buffer and Compurgator products " And a Compurgator would be - a device that detects waste disposal power versus the anti- torque pressure delivered by the waste perhaps? colin -- cdb, cdb@barnard.name on 31/03/2002 -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.