There's no way to install your own s/w on a TiVo, at least not on any recent models. There is a way to create a program that runs on the PC but is accessible by the TiVo
I think what everyone is asking is: What do you want this s/w to do that can't be done now? IOW, what functionality would you be adding?
James L. Sutherland
"You know TiVo users. Bunch of b****y little girls" TiVoAxe
"Jessica Fletcher visits Midsomer. Carnage ensues!"