Auto loading indicators on call and unloading

When trading I would like for some indicators to load up on the screen and exit 15 minutes later.

Are there any examples or articles?

ChartIndicatorAdd(), ChartIndicatorDelete()

Thank you its wonderful.

I bought a third party indicator and i am not sure what the shortname of the indicator is. My requirement is that I just get result of the indicator and unload immediately from the chart as the indicator displayed on chart is performing numerous calculation and is taking forever to backtest. Please advise.