The script downloads the historical quotes data of a single timeframe for all symbols in the market watch. This is convenient to conduct more backtesting on a single timeframe that you usually work with.
Also, to avoid errors that occur when working with symbols/timeframes which have insufficient quote history. An indicator or an expert running on that chart may encounter an error caused by the absence of history required for its calculation.
The script is also useful when you work with other symbols different from the current chart symbol.
The idea of emulating pressing "Home" button is inspired by the original s-Downloader script.