Hi Fubax, it's a little different in v3 and v4.

v3 uses a now pretty old interface from 3DConnexion called TDxInput.dll , which you can get from here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=816.5

TDxInput.dll implements a COM object and MoI creates the COM object and gets some interfaces from it for registering callback functions. You can find these interfaces by opening TDxInput.dll in the OLE/COM Object Viewer program. I guess it would be possible for you to make an implementation of those.

For MoI v4 MoI uses the latest 3DConnexion library siapp.lib which is linked directly with moi_lib.dll , it's not quite as loosely coupled as the old one so it's probably harder to set up a custom version.

- Michael