Battery Status of Wireless Keyboard/Mice?

Elvii asks: "I'm looking for a wireless keyboard/mouse solution for my system. My first choice is the Logitech Cordless Desktop because I've seen them and like them, (works as standard keyboard and wheel mouse, to the best of my knowledge) but I'd like to be able to monitor the battery life in the keyboard/mouse as the Windows software can do. Anyone know of software or specs for these types of things? Logitech hasn't answered my email request for help yet." Is this yet another closed spec that Logitech would do well to open up? Is this feature available for any other OS aside from Windows?