The system does not repaint. When there is a signal the system will create an red or green arrow on the screen at the entry price of the signal. This arrow will stay on the chart forever unless MT4 is restarted or the chart is changed. The signal details (entry price, stop loss, take profit etc) are all displayed in a grey box. This detailed information is overwritten whenever there is a new signal because otherwise the chart would not be readable.
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