Switching between different applications

Hello, I wonder, is it possible to switch between many different Windows Applications during TestCase Execution? Or it is just possible to switch between different windows of the application I already started with WindowsDriver? Because I have one desktop app, that only opens through Browser Plugin, so I can’t instruct Katalon Studio to open it using exe file. It just need to find it once it’s already open. I am having so much trouble doing this, so any help would be appreciated.
Also, I just tried to switch to already opened but minimized PowerShell Window and It waited few minutes and then it said it was successful, but PowerShell still stayed closed. So is it possible to only create a test for 1 concrete application chosen at the beginning, and then do some actions on it, or is it possible to do switch apps freely?
Thanks so much!!!