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User's looking to use XFire on a new project, should use CXF instead. CXF is a continuation of the XFire project and is considered XFire 2.0. It has many new features, a ton of bug fixes, and is now JAX-WS compliant! XFire will continue to be maintained through bug fix releases, but most development will occur on CXF now. For more information see the XFire/Celtix merge FAQ and the CXF website.
To use the Fews PI service from other programming languages, see Using the Fews PI service from C, which also contains an example of using Tcl.
You can run the FEWS system in the background, if this is needed or desirable (see below).
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