Hi,
There isn't one, I'm afraid. TG2 doesn't work with Xgrid unless you can set up Kerberos/Single Sign On. The problem is that TG2 needs a connection to the OS window server to run, and Xgrid runs jobs under a "nobody" user with limited permissions which doesn't allow connections to the window server. If you are able to set up Kerberos/Single Sign On then you could run TG2 via Xgrid in a normal user account, but I personally haven't been able to do that yet.
At some stage we are looking to make a "headless" render node version of TG2 and that should work with Xgrid. For now there are other batch processing/render queue systems which do work with TG2, although which ones they are escapes me right now I'm afraid! I think Condor was one, but I know there are others.
TG Mac v0.9 only works with the prerelease version of Xgrid and not the version which was eventually released as part of OS X 10.4 or whichever it was.
Regards,
Jo