I swear to god that I did exactly as told. I cut and pasted the listerner.ora and tnsnames.ora and TNS_ADMIN for one lisetner. Still I get ORA-12500 when I tried to connect 803 from 92. I solved the problem by going back to two listeners.

Just wondering - is this a 803 bug? or win2000 config issue?

Thanks for all your help.