Technical Details
PM follows the Common User Access interface conventions. It also supports mouse chording for copying and pasting text.
An important problem was that of the single input queue: a non-responsive application could block the processing of user-interface messages, thus freezing the graphical interface. This problem has been solved in Windows NT, where such an application would just become a dead rectangle on the screen; in later versions it became possible to move or hide it. In OS/2 it was solved in a FixPack, using a timer to determine when an application was not responding to events.
Read more about this topic: Presentation Manager
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