You will get a short flicker, but this does it:
DesktopW = User32_GetSystemMetrics(0) DesktopH = User32_GetSystemMetrics(1) WinW = GraphicsWidth() WinH = GraphicsHeight() ; Get hWnd pointer For the Blitz Window hWindow = User32_GetActiveWindow() ; Set the Blitz Window Style User32_SetWindowLong(hWindow,-16,$10000000 + $80000) ; Resize and center Blitz Window User32_MoveWindow(hWindow,(DesktopW-WinW)/2,(DesktopH-WinH)/2,WinW,WinH,True) WaitKey() EndGet the decls in the code archives two posts up.