[Tradewinds]

A section of code can be designated to only run once. This may improve performance if the indicator has lines of code that only need to be run one time initially. For example, the code could have a conditional check to determine if the current bar was the first bar on the chart, and make an initial calculation. But that conditional check will run every time there is a new bar on the chart. This conditional check on every bar would be inefficient and unnecessary on every bar except the first one.

One example of using the reserved word "Once" is when you want text to only show up on the current bar, and not every bar of the chart. The "Text_New" reserved word adds a text object to the chart only once, then the subsequent position of the text object is constantly updated with the Text_SetLocation reserved word.

Once 
	begin  
	Value1 = Text_New( D, T, (h+L)/2, "  Begin" ) ;  // Text_New add text object
	end;

Text_SetLocation(Value1, D, T, (H+L)/2);  // Text location updated to current time