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"The" Workplace Shell is OS/2's user interface. Born in OS/2 v2.0, it incorporated highly advanced technology for its time. It is also an object-oriented framework which allows expert programmers to re-use and modify its code.

The WPSs malleability is also its greatest weakness. Over time, depending on what is installed, it becomes unstable, leading to hangs and crashes, leaving the OS unusable.