For a long time FTP had to be purchased as part of the "Arpa Services/3000" package; but as of MPE/iX 5.0 both the client and server are bundled in the operating system. FTP allows you to send and receive files between systems over a network. HP3000's FTP has some extensions to allow the preservation of HP3000 file attributes, but it usually takes some manual specification on the client side.