Office 2013, especially the preview version of Office Home & Student 2013 RT that comes with the Microsoft Surface tablet, changes the model for writing add-on programs. There are now Office apps and an Office app section in the Windows Store. Many of these apps are free, but it's easy to see enterprise-oriented apps being developed and charged for. Microsoft's implementation of the apps in Office 2013 is clumsy in some ways, but promising.
This app for Word 2013 appeared as a narrow panel on the right. Note that while the vast majority of Windows and Windows RT apps are full screen, in the Windows 8 style formerly known as Metro, Microsoft's own Office apps run in a familiar desktop environment that allows multiple windows open at the same time. However, these Office apps do not take advantage of this ability.
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