Checking closing prices and indicator values "end of bar" vs "intrabar"

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Hello. I've been coding EAs for almost a year now, but all of them have used my original code to check closing prices and indicator values of the last closed bar.

I am going to start from scratch on a volatility breakout EA and I "think" that I want/need to check "intrabar" prices and indicator values so as to execute trades that meet my intrabar criteria. (In essence, I want to get into the breakout during the large breakout bar, rather than after it.

Would someone please explain and/or share a code fragment which checks "intrabar" prices? Also, can indicator values be checked "intrabar", or are they only available after a bar has closed?

Thank you so much for your assistance with this.