How do I enable TXAA within my game engine?

I’ve been searching around for a code sample of how to enable TXAA and couldn’t find anything. I am running a Nvidia Geforce GTX 680 card. Inside my program I wrote to file what the multiple sample qualities and level the device could have. So, I’m using sample count of 8 and quality level of 32. I still don’t know if that would be TXAA…Would anyone like to point me in the right direction? Is it a library or is it done within a shader file? Thanks!

i know this aint the answer your looking for, but for now you could just force it on Nvidia control panel… ok i did some poking around in google and i think this link might interest you, its add on for forcing AA in most games

looks like its similar to sweetfx if you have ever used that before.