Prior to tabbed browsing, browsers acted like 'normal' (SDI) Windows apps. The complaint about Excel is that it's an 'old-fashioned' MDI application and is miss

Prior to tabbed browsing, browsers acted like 'normal' (SDI) Windows apps. The complaint about Excel is that it's an 'old-fashioned' MDI application and is missing UI widgets for easily switching between documents. (And that it's behavior is inconsistant because you can easily open multiple root windows.) http://en.wikipedia.org/wiki/Multiple_document_interface http://en.wikipedia.org/wiki/Multiple_document_interface