On the Alpha with VMS 6.1 I got exactly the same. Erik On Mon, Jan 14, 2013 at 06:29:22PM +0100, G. wrote: On Mon, 14 Jan 2013 18:20:43 +0100, you wrote: I had to try too, under VAX/VMS 5.5-2: Me too! VAX/VMS V4.7 :) $ monitor ethernet MONITOR> monitor ethernet %MONITOR-E-NOCLASSES, no classes specified MONITOR> monitor blah %MONITOR-E-INVCLSNM, class-name "BLAH" is invalid or not uniquely identified Who offers more? :P G.