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+i - Designates this client 'invisible'.
+g - "caller id" mode only allow accept clients to message you
+ +G - "soft caller id" mode - same as +g but automatically allows
+ anyone who's in a common channel with you to message you.
+w - Can see oper and server wallops.
+o - Designates this client is an IRC Operator.
Use the /oper command to attain this.
* +l - Can see oper locops (local wallops).
* +s - Can see server notices (see /quote help snomask).
* +z - Can see operwalls.
- * +p - Override -- gives you implicit operator access in all channels.
+ * +p - Override - gives you implicit operator access in all channels.
+B - Marks you as a bot in /whois.
+C - Prevents you from receiving CTCPs other than ACTION.
+D - Deaf - ignores all channel messages.