Hi all i want to make a script : while notepad is running a button is visible and when Notepad is not running the button is not visible and when i press the button try.exe is opened #include <WindowsConstants.au3> #include <GuiConstantsEx.au3> $GUI = GUICreate("MY GUI", -1,-1,-1,-1, $WS_POPUP , $WS_EX_TOPMOST) $but = GUICtrlCreateButton("", -1, -1, 100, 100) guisetstate() While 1 $nMsg = GUIGetMsg() WinSetOnTop($GUI, "", 1) $menu = WinExists("[CLASS:Notepad