i have a main app the execute a bussiness app

the main app is just for checking in the a server dir if the exe has been update, if so i replace the bussiness exe file and execute it with the shell function

my main app is a main program

but when i run the bussiness app the main app remains in memory.

how do i avoid that, i want the main app finish its execution.

and the bussines app keep running.