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Hi Martin! (it is funny to greet someone with the same name as yourself xD)

openni_launch has a parameter named device_id that allows you to select the kinect that you want to use:

<!-- device_id can have the following formats:
     "B00367707227042B": Use device with given serial number
     "#1"              : Use first device found
     "2@3"             : Use device on USB bus 2, address 3
     "2@0"             : Use first device found on USB bus 2
 -->
<arg name="device_id" default="#1" />

so, for instance, you can do:

roslaunch openni_launch openni.launch device_id:=whateveryourdeviceidis

I hope this helps