the syntax of the DDE for different brokers

 

Hi!

I need the information on how to combine two DDE from two different brokers.

 the syntax of the DDE : MT4|BID!GBPUSD

The "MT4" doesn't care which broker's terminal is open and it seems that he just choose the broker to connect randomly.
is there any way to change that like MT1,MT2,MT3 etc

or Is there a way to solve this problem? 

Thank You