On Friday 11 February, casillas_juan_M/madrid_tecnologia2@sinvest.es wrote: > class Echo_i: public virtual _sk_Echo { [...] > class More_Derived: public virtual Echo_i { You should be able to do this with no difficulties. Cheers, Duncan. -- -- Duncan Grisby \ Research Engineer -- -- AT&T Laboratories Cambridge -- -- http://www.uk.research.att.com/~dpg1 --