Hi there
I suspect the answer to this is no, as we use proprietary forum software which does not have this particular functionality built in. However, I will run it past Karl from WCCL, the all-powerful 'Admin', and see what he says.
As you say, one solution would be to pre-compose (is that a word?) all your messages in a word processor and do the spell-checking there, then copy and paste your message into the forum.
Nick
