Usage: DCC CLOSE <type> <nick> [<arguments>]
  DCC CLOSE closes an unwanted DCC connection or offer. The type,
  nick and arguments are the same as those shown by DCC LIST.
  If the arguments are not specified, the oldest connection of
  the specified type is closed.

  If CLOSE is used before a connection is established, it is
  considered to be rejected, and a CTCP_REPLY to that effect is sent
  to the remote client.

See Also:
  DCC LIST
  DCC RENAME
