Android Question How to execute another app. from my app ?

Dear all.
Greetings,

I need to execute another app. ( say: Messenger of Facebook ) from my b4a app.

Like in VisualBasic (ex: Process.Start("D:\Folder\OtherApp.exe")) even I can send arguments to this executable to run certain function inside it.

I hope also to find a way to control this App ( ( say: Messenger of Facebook , to start communication or answer call from other side) , there is any way to do that ??

Thanks on advance.