
	integer in network byte order. The sender should not continue
	to transmit until the recipient has acknowledged all data
	already transmitted. Additionally, the sender should not
	close the connection until the last byte has been
	acknowledged by the recipient.

	Note that it is not possible for the recipient to tell if the
	entire file has been received - only the sender has that
	information, although IRCII does not report it. Users generally
	verify the transfer by checking file sizes.

	Note also that