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If understand the question correctly, you are looking for a programmatic way to query data notifications? Unfortunately this is not currently possible but is something we are considering for the future.
Recording Functionality using the RFA API
Need sample application with RFA.NET to get Market Data/TREP via EZD?
How can I know which legs of a strategy are being bought and sold?
Do I get a clean or durty bond price in TRDPRC_1 field