Galaxy Communicator Documentation:

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The Galaxy Communicator software infrastructure is a distributed, message-based, hub-and-spoke infrastructure optimized for constructing spoken dialogue systems. The Galaxy Communicator infrastructure is an extension and evolution of the distributed infrastructure for the MIT Galaxy system, and is being developed and maintained by the MITRE Corporation under the aegis of the DARPA Communicator program. The Galaxy Communicator infrastructure is available under a liberal open source license from the Galaxy Communicator Sourceforge site. This is version 4.0 of the Galaxy Communicator distribution.

The HTML version of this documentation is best viewed with a recent standards-compliant browser such as Mozilla 1.0.

This documentation is divided into four parts:

Before you begin, please read the introduction and overview, which will help you decide whether the Galaxy Communicator infrastructure can help you.

Help and feedback

General instructions

There are two resources available to you: the Sourceforge bug queue and the public mailing lists. Please do not send messages directly to the individual developers. It's easier for us to track problems and respond promptly if you use the mailing lists or the bug queue. If you receive mail from an individual developer in response to a submission to the bug queue, feel free to reply, but please do not delete any "CC:" entries in the mail you receive.

We recommend that everyone who uses the Galaxy Communicator infrastructure subscribe to the main public mailing list, for release announcements and other information you may find useful.

Getting help

If you need help with the Galaxy Communicator infrastructure, please start with the following steps.
  1. Finish the tutorial. We've tried to design the tutorial to answer the most basic questions and provide a common vocabulary. If you don't know the information in the tutorial, you probably don't know enough about the infrastructure to ask your question.
  2. Skim the advanced topics. The first paragraph of each topic describes the basic purpose of the document. The answer to your question may very well be there.
  3. Read the frequently asked questions. They really are the most frequently asked questions.
We do realize that people don't like to read documentation, and we also realize that there's a great deal of it (pushing 800 pages in the latest PDF version), but it's really a tremendous source of information about the Galaxy Communicator infrastructure. Most likely, the first question one of us will ask you is whether you've followed these three steps.

If your question still isn't answered, then by all means send a query to one of the addresses above.

Reporting a bug

It's best to send a message to the Sourceforge bug queue as described above.

Feature requests

Either the public mailing list or the bug queue is fine.


If you intend to run the examples in the tutorial rather than simply read it, make sure that the Galaxy Communicator distribution has been installed so that the tutorial can be run on Unix or (as of version 4.0)  Windows.

Advanced topics

These topics are also presented in tutorial style, where possible.



All bug reports and requests for help should be sent to Sourceforge bug queue. Please do not contact members of the Communicator team directly.

License / Documentation home / Help and feedback
Last updated September 24, 2003