Assuming that your acct.no. differ in the last 3 numbers I would calc:
string acct = (string)(AccountInfoInteger(ACCOUNT_LOGIN) % 1000); // not tested, just typed!
and start the PushNotification with it.
How to set notification? i been using a while and found out no notification show when there is a message came in.
Ideal, I think, would be to write to a common file and do a count from that information. The problem is the "Sandbox". How would I go about getting information outside the MT4 structure and
write to a file reachable by all MT4 instances?

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I have a bunch of accounts (on different MT4 instances) that I have running the same EA. To be sure all is opening/closing trades correctly I want to make som kind of alarm
for me to detect when accounts fail to execute a trade transaction.
Since mql4 is "Sandbox" it is hard, but I wanted to reach out here to see if anyone has any idea to solve this dilemma. I have set up mobile notifications. Those are kind of
difficult to get a quick overview of, since every account sends a notification and I need to audit every single message and then delete them for the next execution.
I'd rather have a number of how many accounts sent a message. Any suggestions how to solve this? Thanks!