I have just joined the #Kerthawards channel, but when I try to join the #Kerthchat channel, I get the message, "Cannot join channel (+i)".

I am using Trillian. A few lines previous, I saw a message, "LynnSM sets mode +iw."

I don't normally use IRC, and I don't even know what the "i" and "w" stand for. Could anyone who is more knowledgeable help me out?

Thanks,
Lynn