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explation needed pls

Ca in somebody explain to me what sandbox means and what role does is play while using fileopen() function .And also I copy a file in a directory "file" in mql terminal but this file cannot b open by fileOpen(),not sure I copy the file in the right directory,the file is a txt file.Thank you

TEST GENERATOR UNMATCHED ERROR,WHAT DOES THIS MEAN.

I tested expet advisor on meta trader EA tester,I noticed that The EA was not executed,, I checked the jornal what i saw is this...(2009.07.22 03:28:22 TestGenerator: unmatched data error (low value 1.4192 at 2009.07.22 13:15 is not reached from the least timeframe, low price 1.4193 mismatches).I

HOW TO?

can anybody give a suggestion if possible on how to draw an horizontal tine using an Expert advisor,such that the horizontal line limit is defined rather than extending throuhgout the chat e.g drawing a line so that it only extend from say time[17] to time[3]; and not going beyond these limit,Thanks

trendline break,using icustom;

Please can anyone help with this idea.I will like to get a particular value(price) at a particular bar say bar[1],such that the price at which if price hit will result in treand line break occur can be returned using iCustom (...........).your suggestion will highly be valued thanks

HEDGING THE SAME CURRENCY PAIR,a problem!

I try to write an EA where two opposite instant orders of OP_BUY and OP_SELL COULD BE OPEN .I discover only one of the order keep opening, the other being ommited.Why? int start() { //---- if (time0 != Time[0]) {

imagine this scenario,what will happen

I am new in EA coding,but i don't know if it is possible to put an EA WITH SAY "trader xpert" in more than one security window e.g the same expert being placed to trade in EUR/USD WINDOW,EUR/GBP WINDOW,USD/JPY WINDOW all at the same time with their result not conflicting or affecting one another

PLS HELP LOOK INTO THIS COMPILATION ERROR

It's a simple EA code that brings this error ( '\end_of_program'-unbalance left parenthesis) at copilation) in line(136,4).I have try to check out for this error but I can't find ANY.Pls I need some help,I'm A newbie!I have attached the EA to this text

VOLUME CONFUSION

I have problem understanding the concept volume,there are like three definition i 've seen so far .I don't understand if volume represnt any of these definition:1 amount of ticks in a given time period (2)amount of contract transaction in given time period 3)amount of lot in a given transaction, And

HOW TO?

I do i write a code to search for the highest high of bar series between the opening of last trading seesion and the close of the last trading session .Thanks forum

PARAMETER PASS

WHAT PARAMETER CAN BE PASSED INTO FUNCTION Period() e.g is it possible to pass this parameter period(period_H1).or any other way of passing a parameter into it