Sense Professional is a split screen editor providing highly synchronized dual-pane editing environments for document editing at both outline and detailed text levels. Each screen is locale independent allowing multilingual editing of different documents, or even the same when shared between two screens, to proceed simultaneously. If the outline pane is not needed, swap to a single-pane editing environment. Paragraphs and other document parts may be grouped into expandable / collapsible headed sections (chapters) to provide a hierarchical document tree. Whole and part Sense documents may be merged into a single work document with material automatically adopting the main document style including section and multilevel list numbering.