From GM would be your first choice. What they usually do is to produce sufficient documentation in the form of presentations which tell you how to use the tools.
Steve, it usually starts with the GM buyer/contact rep that your company that signed the initial contact with. If that does not work, have your people contact the GM DBA that is handling the data transfer between your company and the GM project your work is going into.
gmsupplypower.com will have all the info you need for these types of things. You'll have to register, etc. to gain full access...a little tedious, but very well worth the effort.
