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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