Modal processing is a way of enforcing the progressive focus approach. For a definition of focus, see Progressive Focus Approach.
A modal window is displayed in front of the window that invoked it. The modal window has focus. The user cannot obtain any previous window while the modal window has focus. However, the user can move the current modal window to view the contents of the previous window.
This approach ensures that the user completes the unit of work or cancels it before returning to the previous window.
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