Control an application from another application

Question

I read this question and another question and I understand how to launch an application from another application (Let\'s call the other application LauncherApplication

Answer 1

how do I know in advance the parameters to put in an intent for the installed applications?

You talk to their developers. There are typically zero "parameters" on an Intent to launch the launcher activity (or activities) of an application, since home screens do not put such "parameters" on the Intent.