The KiwiSDRs have many more features than can possibly be covered here - please read the
Quick start guide (link) and follow some of the links within for more information than you probably want.
For more detailed information about the Kiwi's TDOA (direction finding") extension, check out the .PDF on
DK8OK's blog page.
For more general questions about HF and the things you will hear, go to the
WebSDR FAQ page.