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**After checking '''and use constrain''' checkbox select a price or indicator value, comparison type and compared value.
===Starting Pre-Scanning===
When instruments are added into Pre-Scanning Part of the Scanner Window and the pre-scanning criteria is set, scanning can be started. To start scanning click the '''Rescan now''' button.
'''Rescan now''' button initiates both historical and realtime snapshot data requests. The data is requested partially depending on the limitation of the data source thus the data is received for a numerous instruments without breaking the limitations of data source.
Once '''Rescan now''' button is clicked, it changes to '''Stop Scan'''. At this moment, historical and real-time data request is requests are sent for the number of the instruments added into the historical part of the scanner window. As soon as all the historical requested data is obtained, instruments will be unsubscribed from the data source and data will be requested for the next set of instruments. The results are evaluated by the scanning criteria and satisfying instruments are copied into the Real-Time Watchlist part of the scanner window.
<div style="background-color: #E3FBE5;">Note: The instruments will be copied into the Real-Time scanner only after all the historical data is obtained and all the studies are calculated on this data.</div>
