The CTCP service (client-to-client protocol) answers to special queries sometime made over the IRC protocol. These are generally of metadata about the client itself and its capabilities.
Sends a list of which CTCP events we understand.
Handles CTCP requests.
The CTCP service handles responding to CTCP (client-to-client protocol) requests behind the scenes.
It has no commands and is not aware in the normal sense; it only blindly responds to requests.