A class that cannot be instantiated directly. You can only instantiate concrete child classes. A class that contains an abstract member is abstract. You also can mark a class as abstract even if it contains no abstract members. In contrast, a concrete class is any class that is not abstract.
A parent class member that must be overridden in a child class.
The process of moving common members from two or more classes into a new parent class.
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A key that a user can press with the Alt key to navigate through the menu hierarchy. For example, Alt+F typically opens the File menu.
In a modal dialog box, the button that fires when the user presses the Enter ...