If you're wanting to spawn a process and continue on without waiting plus collect data from the spawned process later, you could use threads. To do that, just start a thread that does the background process and your main code will continue on without waiting. And then you can join the thread(s) later to collect their return data.

However, if you're just wanting to spawn a process and are never concerned about ever checking on it, BrowserUk provided one method for doing so. I was not aware of that method, but I have successfully leveraged the start command available from the command prompt environment. It basically starts a new command prompt to run the desired command and then immediately returns. You can open a command prompt and type start /? to get details about the options for the start command.