A window's size and position can be expressed as a bounding rectangle, given in coordinates relative to its parent. An application specifies the window's initial size and position when creating the window.

To use the system-default values for the initial size and position of a frame window, an application can specify the FCF_SHELLPOSITION frame-creation flag. The application can change a window's size and position at any time.

Note:

The default coordinate system for a window specifies that the point (0,0) is at the lower-left corner of the window, with coordinates increasing as they go upward and to the right.

A window can be positioned anywhere in relation to its parent.

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