By default Process Explorer sorts processes into the system process tree. The process tree reflects the parent-child relationship between processes where child processes are shown directly beneath their parent and right-indented. Processes that are left-justified are orphans; their parent has exited. To change the sort order simply click on a the column by which you wish to sort. To return the sort to the process tree select View|Show Process Tree, click the process tree toolbar button, or type Ctrl+T.