In WinAutomation, you can execute a job in the background only if you do not use any interactive actions to build it. Interactive actions include all actions under "Windows" category (e.g "Focus Window", "Close Window" etc) and "Mouse and Keyboard" category (e.g "Move Mouse", "Send Keys" etc). If you do use such actions, you will not be able to run the job in the background (e.g. when there is no user logged in the machine or when the computer is locked). Of course, if your job includes file and folder related actions, or sending emails, zip files, ftp, then you can totally use the machine to execute other tasks while your job is running in the background.
