The crossed daily highs resistance alert reports whenever a stock crosses above any previous day's high for the first time since the end of that previous day.  The crossed daily lows support alert reports whenever a stock crosses a previous day's low for the first time since the end of that previous day.  These compare the current price to the daily highs and lows for the past year.

These alerts are a variation on the idea of a 5 day high or a 52 week low.  These alerts tell you when a stock is moving from 5 day highs to 6 day highs.  Or from 6 day highs to 7 day highs.  Etc.

The messages and the filters for these alerts are the same as for the new high / low price alerts.  In fact, these alerts are a subset of the standard daily high / low alerts.  These alerts only report when the number of days in the new high or low changes.