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The workaround by WinEDT 5.5 beta4 sends a menuID command to Acrobat telling it to close. You can see this in the macro: C:\Program Files\WinEdt Team\WinEdt\Exec\Acrobat CloseDoc.edt line 38. Here the variable $('Acro-CloseMenuItem'); is set in Winedt from the menu bar:
Options->Execution Modes ...