The answer is the number of the bar that holds the highest value. Basically, you specify the range of bars from what you want the bar that has the highest value.
Data
Symbol (optional)
The symbol name.
If not specified, the chart symbol is used.
Time Frame (required)
The time frame.
Series (required)
The value you want to compare among bars.
Count (required)
The number of bars to compare since the Start one.
Start (required)
The number of the bar from what the comparison starts.