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Help with coding alerts

Hi, I'm new with mql4 and coding as a whole so can any of the experts please help me with the following two dilemmas. I need to add an arrow and alert when price breaches an MA from above, but it should repaint as when the price does not close below the MA to disappear again. It draws the arrow and

Using Comment for EA

I've just started learning myself mql4 and so far it's going better than a week ago. I'd like to know how can I use a Comment that is posted on the Chart by a seperate indicatot to be called in an EA for use there? Basically what I'd like to do is using a comment that is posted of the HTF indi about