pg 24 exp 2	

 REGISTERATING  THE  WINDOWS  CLASS

           A window class has nothing to do a C++ class.Window class window category.Aset of attributes is given a name called as window class name.This class name is later used to create any number of windows.
           RegisterclassEX function links the window class name with the set of attributes of the window. CreateWindowEX function uses the window class name to create a window.

 CREATING  THE  WINDOW

            Create WindowEX function uses the window class name to create a window.
This function allocates memory to the window but does not display it on the screen.

 DISLAYING  THE  WINDOW

           The Show window function displays the window (on the screen) whose handle is specified.It can be shown in different states:restored , maximized , minimized.

 THE  MESSAGE  LOOP

            Messages are represented by numbers and integer constants.
            Message indicates that a paticular event has occurred.
           Eg.:key press , mouse click , maximize close etc.