Windows 7 and above has this useful "displayswitch.exe" tool which can be invoked with the Win+P shortcut. I'm trying to replicate this feature in my old Windows XP installation using Clavier+ and a batch script.
I prefer a solution that does not require installing other 3rd party tools aside from these: AMD's own CCC, Ray Adams' ATI Tray Tools, and NirSoft's freeware tools.