An application sends the WM_MDICASCADE message to a multiple document interface (MDI) client window to arrange all its child windows in a cascade format.
WM_MDICASCADE
wParam = (WPARAM) (UINT) fuCascade; // cascade flag
lParam = 0; // not used; must be zero
If the message succeeds, the return value is TRUE.
If the message fails, the return value is FALSE.
Windows NT: Requires version 3.1 or later.
Windows: Requires Windows 95 or later.
Windows CE: Unsupported.
Header: Declared in winuser.h.
Multiple Document Interface Overview, Multiple Document Interface Messages, WM_MDIICONARRANGE, WM_MDITILE