Live Feeds are real time data, such as stock prices or fx rates, that are fetched from live feed providers and displayed on the spreadsheet.
Deriscope retrieves live feeds asynchronously from these providers .
The asynchronous mode derives its name from the fact that the data acquisition process runs asynchronously with everything else Excel is doing at that time.
One says that a process A runs asynchronously with another process B, if the two processes run parallel to each other on separate execution threads, which simply means that both processes can be active on the same time.
Using thread terminology again, the asynchronous mode means that the data acquisition process runs on a different thread than that utilized by the main (user interface) Excel.
Deriscope implements asynchronous live feeds through the Excel formula named