Hi,
Thank you very much for your assistance in providing this service.
Basically it is a very simple indicator. When you add it to your chart it colour codes the three trading sessions and 1 hour preceding the opening. It boxes out the session highs and lows.
https://www.mql5.com/en/code/7753
I use this indicator to understand session highs and lows and movement before actual market opens and trade around it or manage trades around them.
The session timings are as follows UK times.
Asia: 1 am to 4 am
London: 7 am to 10 pm
US: 1pm to 4 pm
I hope i have given you enough information.