Hi Lee, I added Chimera support for the Space Navigator 6-degree-of-freedom input device (costs only $60) for Mac and Windows. http://www.3dconnexion.com/ I expect it will work with other 3dconnexion devices such as your Space Explorer. If you download the current Chimera daily build http://www.cgl.ucsf.edu/chimera/alpha-downloads.html for Windows or Mac OS and have the 3dconnexion driver installed, the device will move and rotate Chimera models. I have only two button assignments: Button1 or Fit centers the models and scales them to fit in the window, Button2 toggles a mode allowing simultaneous rotation and translation (default off is called "dominant" mode by 3dconnexion). The Windows Control Panel or Mac OS System Preferences lets you change the assignments of the device buttons. You may not have any assigned to be "Button2" unless you change those settings. There are also a few keyboard shortcuts that change modes. Shortcuts or Accelerators are turned on with menu entry Tools / General Controls / Accelerators On. Shortcut "nf" turns on "fly through" mode. Instead of the device behaving as if you are holding the models it is used to control the viewer position (ie. pushing forward flies you forward rather than pushing the models away from you). It is hard to control -- needs more programming work. Shortcut "na" allows the device to move both inactive (frozen) and active models. This can be useful if you are docking a molecule into a map with the mouse and changing view points of both molecule and map using the space navigator. Shortcut "nd" toggles translate/rotate only mode (i.e. "dominant" mode). I just added that today so it won't be in Chimera until tonight's builds. Tom