I may be misunderstanding what you're trying to achieve, but you can simulate the bash '&' operator for a running process by pressing ctrl-Z to suspend the process and send it to the background, then running 'bg' to…
This type of scene is called a Cornell box, often used to test rendering capabilities. https://en.wikipedia.org/wiki/Cornell_box
I may be misunderstanding what you're trying to achieve, but you can simulate the bash '&' operator for a running process by pressing ctrl-Z to suspend the process and send it to the background, then running 'bg' to…
This type of scene is called a Cornell box, often used to test rendering capabilities. https://en.wikipedia.org/wiki/Cornell_box