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You can customize Trillian's most commonly used keyboard shortcuts and behaviors as they relate to message sending. For example, you might prefer that
Enter doesn't send messages but inserts a newline instead.
after I send a messageoption protects you from disclosing that you are typing a message before it's sent, but only fires for the first message in a chat window. This might make sense for you if you have a habit of opening a window, typing a message, and then deciding not to send it. In this case,
after I sent a messagewould prevent your contact from seeing your typing indicator at all.