Dear Mr. Rosh May I understand the rules in right way or not

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Hi ! Rosh

If I put an ea with a modify function on a H1 chart

doing the back test.

How does the modify work ?

Does only the modify function act once at the beginng of one hour ?

Or the modify function respond the price in 2 - 5 seconds as you said ?

Or I do something wrong at the program to force the function respond one time in one hour ?

May be the program below do the wrong thing ?

int start()
{
if (Time[0] == prevtime) return(0);
prevtime = Time[0];

......

Thank you in advance !