a) only people from the countries listed can apply online, (excluded countries can apply for ETA by another method)
b) only people from the countries listed can apply for ETA period, all other countries are excluded period (and should chose a different visa).
Perhaps ETA is a purely electronic system, and my question is not that bright, but being that things are often not as they seem in the happy/dancing realm of immigration, I know you will forgive me for asking! Thank you!
![Confused :?](./images/smilies/icon_confused.gif)