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# Select '''Online: Load the locally stored data and connect to a real-time data feed''' to switch software to online mode and get access to data from data vendor servers.
# Check '''Download missing historical data''' to download the missing historical data from a data provider; clear the checkbox to work only with real-time data and locally stored data (no historical backfill from data vendor).
# Select '''Offline: Use only the locally stored data''' to work only with historical data that is already saved in the database. No additional data will be requested from the data provider in this case.
# To show the '''Data Server Mode''' tab on software startup, select the '''Show Data Server Mode dialog box on startup''' checkbox; clear the checkbox not to display the dialog box.
<div style="background-color: #E3FBE5;">'''Note''': In order to switch between the modes or turn on/off the "Download missing historical data" box, all workspaces should be closed in all opened instances of MultiCharts, forward-testing and autotrading should be stopped in Portfolio Trader and QuoteManager should be closedexited, no [[Time and SalesForex_Board#Forex_Board_Service_Window|Forex Board service window]], should be dectivated and [[Understanding RealPre-Time Market ScannerScanning_and_Watchlist#Scanner_service_window|Service service Scanner]] or [[Dom|DOM]] window should be activatedcleared of all symbols (or also deactivated). </div>
To learn how this page affects data collected in MultiCharts, please read [[Collecting and Saving Data to MultiCharts Database|this article]].
