Attached Link: http://support.smithmicro.com/cs/smkb.cfg/php.exe/enduser/std_adp.php?p_faqid=2035

 bishop666, you can assign Python scripts to the extra buttons in Poser.

Quote - The buttons on the SpaceNavigator can be used for more than just resetting cameras- you can set up Python scripts which can be triggered by clicking those buttons as well. To do this, put the scripts in a folder titled Runtime/Python/poserScripts/3DMouse. The scripts must be named ButtonX.py where X is the button number which will trigger the script. Users of other 3D controllers from 3dconnexion (SpacePilot, SpaceTraveller etc.) can use those products as well within Poser.