One EA at a time one pair at a time.

Hi,

I have a EA attached to multiple currency pairs charts.

When one of the currency pair has open position or pending orders rest of EAs should go inactive.

There must be only one currency pair open at a time.

When there is no open position or pending orders then all EA should be active.

Pls purpose your solution with any of Expert Advisor or Script or whatever solution is available to achieve above requirement.

Thanks