Button_Click Call

I need a function written in Visual Basic that being passed the process ID if an external app will open a form and call the Button_Click event. The external app is Meta Trader, I need to be able to pass the process ID or the EXE name, The currency pair to trade, Set the max deviation from price and fire the trade. I do not want an EA, Mouse clicks are not allowed. I run around 200 Meta traders on a server, so mouse clicks will not work. I need the source code, which will be my copy right. I am am a programmer myself, so just need the function to add to my code.