A view that contains two views. The view in the lower pane shows detailed information about the tasks or resources selected within the upper pane. The 'Task Entry' view (for example) shows a Gantt chart view in the upper pane and the task form view in the lower pane. When a task is selected in the Gantt chart, the task form view displays detailed information about that task shown above. The resource allocation view is another useful combination view.
'SOURCE; microsoft project glossary-projectlearning.net