Azeiron

I'm currently working on a modpack of my own, I've read the forum posts on how to go about doing that and all that stuff, but how do I make two mods for different versions of minecraft work together? I know it's possible because the guy who made Attack of the B Team managed to get the latest version of Tinker's Construct (1.6.4) working with mods for other later versions. How in the scat is that done? Any help is greatly appreciated. Cheers. 0==[]===Aze===>

Does anyone know when hexxit is getting the 1.6 update? Simple enough question for how many hoops I just jumped through to register and post one sentence. Ha.