Detect a sequence of keystrokes in an os independent way

[Rajanikanth Jammalamadaka]

Hi!

Can somebody tell me if there is an os independent way to detect a
sequence of key strokes. For example, I want to start some other
program once the user presses a couple of keys: ex: key a and then key
b

Thanks,

Raj

-- 
"For him who has conquered the mind, the mind is the best of friends;
but for one who has failed to do so, his very mind will be the
greatest enemy."

Rajanikanth