If it’s not a laptop (i.e. the screen is separate), it’s even easier than that. Check the back of the monitor for an S-Video port (most recent LCD monitors have them), and use the cable that came with your Tivo to hook up. If you’ve got a very recent Tivo and Monitor, you may be able to do the same thing with HDMI (which also came with the Tivo).
If the monitor only has VGA and DVI ports, you can get adaptors for SVideo-to-VGA or HDMI - to - VGA, depending on your Tivo’s capabilities, but you’ll have to buy those separately.
A few monitors also take component (R, G, B) or composite (yellow) connectors. You guessed it, these came with your Tivo (not the component if it’s a pre-HD Tivo). Sound may or may not be a problem; if your monitor doesn’t have speakers, you’ll need to run the Red/White RCA ports to a speaker system somewhere.
In any of these cases, the computer never has to get involved at all. You may need to find the magic sequence of button pushes for your monitor that gets it to change inputs, though. (Mine is a single button on the front, but some other monitors I’ve used you have to go through the menus).