Automatic switching on/off expert adviser

I have several EA running on 1 single MT4 platform. I wish to have a functionality that once a trade has been entered by 1 EA, to switch off the other EAs.

For example say I have 5 EA running which are A,B C, D and E respectively each EA will enter trade with an unique magic number. Say when a trade has been entered by A, i wish to switch off B C, D and E. Once the trade entered by A is closed, EA is to be switched on for B C, D and E automatically.

Detailed requirements are as follows:

1. When a trade has been entered by 1 EA, to switch off all other EA in the same MT4 platform
2. When there is zero open trades, to switch on all EA in the same MT4 platform
3. When there are open trades with different magic number, to close the trades of the magic number that was entered later. Example, there are 3 open  trades. First 2 trades has magic number 123 and last trade has magic number 456. If the trades with magic number 123 are entered earlier then trades with magic number 456, then close trades with magic number 456. Vice versa.