Figure above dialog box, which will be displayed above elements in ThreadTestQF.rc (below). CAPTION which is the title of the window at the top left.
And IDD = IDD_THREADTESTQF_DIALOG (according to the characteristics of an assignment, that is the known value of enum element IDD_THREADTESTQF_DIALOG) data indicates the dialog, the dialog box as a member of the class data.
Dialog is usually created in the App class, and use.
