File transfer between the SOS machine and the kiosk is not trivial since these
two machines use very different operating systems, Ubuntu Linux and Microsoft
Windows, respectively. Beginning with version 5.1, the kiosk software supports a
direct transfer between the two systems from the FTP tab in the Administration
UI. This functionality uses the industry standard File Transfer Protocol (FTP)
software. On the SOS machine, the very secure FTP daemon (vsftpd)
server can be installed using the normal Ubuntu apt-get commands and
by editing a few configuration files.