"a close all " EA?

I run several different EA's on different currencies simultaneously.

At any given time I can have 50+ open positions, and the net profit/loss swings rapidly during the day.

How difficult would it to be to have one EA running that said:

if total account value + value of open positions = $XXX, then

stop all EA's
close all charts
close all open positions

Is this type of "account level" EA possible?

If your question is the possibility, yes. Except, I don't know yet about EA act to close all EA.

I have a script, not an EA, let me know and I'll dig it up.

try this one..it closes all orders when a specified equity level is reached..but only orders..not other EA's..

To my knowledge there is no simple way to stop one EA from another unless the EAs were expressly designed for that behavior.

You can certainly close all the orders, but if the EAs are still running they will likely trade again.

A complex solution to stopping EA's that were not designed to be stopped automatically would be to write an external DLL that simulated a user command to MT4 to stop all EA's. That is something I have toyed with doing, actually but it would take a bit of time.