Although you don't have to understand much about OpenVPN, the FOSS ('''F'''ree '''O'''pen '''S'''ource '''S'''oftware) program Amahi uses for secure connections from outside your Amahi HDA ('''H'''ome '''D'''igital '''A'''ssistant, the Amahi server you've set up), you ''do '' have to have the OpenVPN software installed on your Linux machine. In the case of Ubuntu 9.10 (and 9.04), this isn't installed by default, but, like most Linux '''distros''' (short for ''distributions,'' the “flavor” of Linux you've chosen), this is relatively straightforward and easy.