Asus Xtion, Stream RGB and IR together

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How can http://www.ros.org/wiki/openni_launch/Tutorials/ExtrinsicCalibration be used efficiently? Should I write code that takes in the RGB and IR Image, synchronize the images by using the Time Synchronizer, then publish those synchronized images?

plz go thru this http://www.ros.org/wiki/openni_launch/Tutorials/ExtrinsicCalibrationExternal

That is for external RGB with the Depth on the Kinect. Its not the same as with the on-board RGB camera and the Depth. The extrinsic calibration is quite bad doing the tutorial I posted, in which, I want to be able to move the checkerboard around the image instead of keeping it static.

I guess there wont be any need to write a code to calibrate RGB and IR camera of kinect,

Is there a way to eliminate the depth functionality, and only use RGB and IR? I have multiple looking at the same space from multiple angles, and I want to eliminate interference.