Hi zeltak,
TV out is not TV out! This is one of the worst marketing tricks played upon end users in these last years. You would expect to have an output on both tv and monitor, but this is highly dependent on built-in chip and price!
Basically there are 3 types of video cards supporting tv out:
1) either or cards: Either you get the output on your monitor or on your tv out, but not both. They are the cheapest.
2) support for both with fixed resolution: You get output two both channels, but they adapt to the lowest possible resolution. If your tv is 800x600 your pc monitor will also switch to 800x600.
3) support for both with independent resolution: You get output to both channels, each channel can be set at its own independent resolution such as 1280x1024 on your monitor and 800x600 on your tv or beamer. Of course these cards are much more expensive, sometimes double price.
Look for items such as Clone view, Dual view, Twin view. Some cards support only clone view (same output on both screens), others support dual or twin view meaning that you have independent screens on the two channels. In this case you can have your standard windows screen on your pc monitor and for example a video movie running on your tv. In this case with MC10 you can also run a slide show on one monitor and another slide show on the second monitor.
The tricky thing is that video card resellers make those distinctions very unclear in their naming, especially Nvidia cards.
An Nvidia Geforce4 MX card belongs to the first category, an Nvidia Geforce4 Ti42000 belongs to the third category, don't know about Geforce3. You really have to study specs very carefully. Don't rely on manuals as they are often written for the whole family of cards and you would expect support for dual view, while it is not there.
So I would suggest the following:
1) Study your card specs very carefully, look for dual / twin view mode
2) Upgrade to the latest Nvidia drivers, Dual View mode is continuously improved over the whole family of cards.
3) If it is not there, you need to buy another card if you want output on both monitors.
This can be very tricky, especially if you buy notebooks. Cheap notebooks share video card memory with main memory and do not support dual view. And those that support it cost easily 300-400 U$ more.