Thanks for answering.
Yeah, this side-by-side streaming is also included on the OpenNI viewer, but that's not exactly what I want, because I can only watch the streaming, can't work with it. I need to access some sort of raw data, something like a matrix of (x,y, r,g,b, depth), upon which I think I can apply some image processing code that I'm beginning to study.
In fact, there is an option of capture frames in the streaming tool, I tried it but I'm not sure where the frames are stored, I think it's on the .oni file created in the folder. Anyone know how to open it?