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DarkBoost, Easy when you know how! #include <GUIConstantsEx.au3> #include <WindowsConstants.au3> Global $GUIMINWID = 300, $GUIMINHT = 100;set your restrictions here Global $GUIMAXWID = 800, $GUIMAXHT = 500 GUIRegisterMsg($WM_GETMINMAXINFO, "WM_GETMINMAXINFO") $hGUI = GUICreate("Test", 500, 500, -1, -1, BitOR($GUI_SS_DEFAULT_GUI, $WS_MAXIMIZEBOX, $WS_SIZEBOX)) GUISetState() $aPos = WinGetPos($hGUI) While 1 Switch GUIGetMsg() Case $GUI_EVENT_MAXIMIZE ;WinMove($hGUI, "", $aPos[0], $aPos[1], $aPos[2], $aPos[3]) Case $GUI_EVENT_CLOSE Exit EndSwitch WEnd Func WM_GETMINMAXINFO($hwnd, $Msg, $wParam, $lParam) $tagMaxinfo = DllStructCreate("int;int;int;int;int;int;int;int;int;int", $lParam) DllStructSetData($tagMaxinfo, 7, $GUIMINWID) ; min X DllStructSetData($tagMaxinfo, 8, $GUIMINHT) ; min Y DllStructSetData($tagMaxinfo, 9, $GUIMAXWID ); max X DllStructSetData($tagMaxinfo, 10, $GUIMAXHT ) ; max Y Return 0 EndFunc ;==>WM_GETMINMAXINFO All clear? M23