ACTIVATE A FUNCTION IN CLIENT MT4

we have our our EA. currently its works with our strategy and the only thing we need to do is 

Click a button "BUY" , "SELL" or "CLOSE ALL".   It will take care of the lot size , SL,TP etc.

Now we want to share this signal(only the click) with others who are using our EA.

In other words if in the Master account we click BUY, all those subscribed to us will have their

BUY Function activated and same goes to SELL and CLOSE ALL. We just want the subscriber to activate the 

Funtions.

Need the solution for this