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Hi there,

Supposed I have EA for EurUsd, GbpUsd and NzdUsd. They are attached to their own chart respectively. Supposed due to co-relation issues I want the other two to NOT trade when a position by any one is entered. I was told to use 'CalculateOpenPosition' by the MQL icon.

How is this done?
Any diagrams to show?

If you want to use MQL you need to open a generated ea with MetaEditor and understand how it works
From a generated EA I got this:
if (CalculateOpenPositions(symbol_bn,ordertype_bn,magic_bn)>=MaxNumberofPositions) {
Print("I-Warning : Can not execute new ",OrderTypetoString(ordertype_bn)," order for Symbol ",symbol_bn,". Maximum number of ",MaxNumberofPositions," open positions reached.");
return(0);
}

In the MQL icon in version 3.2 or higher (won't work in old versions) you need to put something like:
CalculateOpenPositions(symbol_bn,ordertype_bn,magic_bn)>=MaxNumberofPositions

You need to replace symbol_bn,ordertype_bn,magic_bn and MaxNumberofPositions with your own info
Like CalculateOpenPositions("EURUSD",OP_BUY,your ea magic number)>=1

unfortunately we do not do MQL support here or teach MQL - we only do product support so you have to do a lot of try and error on your end.

We do not have any examples but I have seen some posts in the forum with some MQL code

I have this question.

symbol_bn may refer to EURUSD if I have one EA only. But if I have many EAs for pairs ending with USD do I define them all or is there a shorter way like xxxUSD?

Unfortunately if you want to use the MQL icon you need to understand MQL a bit
If you want to check 2 pairs, you need to use an AND

CalculateOpenPositions("EURUSD",OP_BUY,your ea magic number)>=1 && CalculateOpenPositions("GBPUSD",OP_BUY,your ea magic number)>=1