Pick two currencies and an amount to convert at the latest published exchange rate. The rate used is shown alongside the result so you can see exactly what the conversion is based on, and swap the direction without retyping.
Almost certainly not. These are mid-market reference rates. Banks and exchange bureaus add a spread and often a fixed fee, so the rate you are offered is typically 0.5-3% worse. Use this figure as the benchmark to judge an offer against.
Rates are fetched when you open the page and refresh through the day. They are indicative reference rates rather than live trading prices, and should not be used for dealing decisions.