The "No trade" function
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If I have multiple EA's going that all have "No trade" function at the top of the tree. Will this only allow one EA to function? (The EA that first enters a trade.)
Does the EA that first enters a trade prohibit all others from working because on all my other EA's I created they start with "No trade" ?
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I'm not really sure I understand the question at MT4/MT5 only allow one EA to run at any one time on a single chart.
If you mean will the EA affect the EAs running on other charts, then, no, as long at they aren't for the same currency pair etc. then a trade on one will not prevent another one from taking a trade.
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This block's name should be something like "Is there any running trade at the moment?". It just tries to find at least 1 trade, and if it finds one, it doesn't pass. Of course, it checks its magic number, symbol and type (buy/sell) if needed, these are the settings of the block. So you can have as many blocks from this one in one EA or multiple EAs. The block doesn't forbid the creation of trades. It's name looks like this only because it needs to be something short.