I'm a newb when it comes to C++ programming and Windows API functions. But I have a friend who wanted me to make a simple DLL for one of his programs (made with a program called GameMaker that can use DLLs). He just wanted something to change the text in the button for his program in the taskbar. I know exactly how to pass the window handle from GameMaker to my DLL, but I do not know the WinAPI function (if it exists) to change the text. Can anyone help, please?