How to get previous days high/low

[PJS]

Hi,

Forgive me for this one. I'm sure it's very easy, but I can't see how yet. How do I get the previous days high/low? I just want to be alerted when todays price breaks the previous days high/low.

Thanks.

[ACM]

PJS
In the OHLC subfolder of Formulas you can find all the efs related to High, Low etc.
Alex