That's not exactly what I meant (and I knew there would be confusion just because of the similar phrasing to other things)... I don't need the process to try to run in the background (which actually won't work), I need the window of the application to open, but in the background not focused.
Maybe an example will help. Say I'm writing a bash script to open my favorite webbrowser to go to a certain website at a certain time (I'm not, but I think the problem is similar). If I'm typing in an unrelated program when it calls it, say a word processor or playing a game, I don't want it to interupt what I'm doing; however, I still want it open (just behind the opened windows, aka not focused).