MDI on the Mac
Mac applications used to have many windows. Recently, this has started to change, mainly due to Apple’s influence. […] However, these applications do not have MDIs. Neither of these applications are multi-document applications. They are either media managers (iPhoto, iTunes, Aperture), or they are typically used to open only one document at a time (iMovie, iDVD, Final Cut Pro).
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Unfortunately, some companies have taken Apple’s new one-window-approach to UI design as a hint that they should introduce MDIs (or an MDI-like approach to UI design) on the Mac.
