void set_telnet_manager(object telnetd)
void set_binary_manager(object binaryd)

    Install a manager for telnet/binary connections, in which the following
    functions will be called:

    * object select(string str)

	Return a user object, selected by the argument string, which is the
	first line of input on that connection.

    * int query_timeout(object connection)

	Return a timeout, after which the given connection is closed if no
	user object has been associated with it yet.  If the timeout is -1,
	the connection is closed immediately.

    * string query_banner(object connection)

	Return a login banner for the given connection.  Nil can be returned to
	indicate that no banner should be shown at all.