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==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 [[message queue|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.
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