System Commands - Win32 Programmer's Reference

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System Commands

An application that has a window menu can change the size and position of that window by sending system commands. System commands are generated when the user chooses commands from the window menu. An application can emulate the user action by sending a WM_SYSCOMMAND message to the window. The following system commands affect the size and position of a window.

Command	Description
SC_CLOSE	Closes the window. This command sends a WM_CLOSE message to the window. The window carries out any steps needed to clean up and destroy itself.
SC_MAXIMIZE	Maximizes the window.
SC_MINIMIZE	Minimizes the window.
SC_RESTORE	Restores a minimized or maximized window to its previous size and position.
SC_SIZE	Starts a Size command. The user can change the size of the window by using the mouse or keyboard.

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