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Document: xpa
Title: XPA: Public Access to Data and Algorithms
Section: Programming
Abstract:  The XPA messaging system provides seamless communication between
 many kinds of Unix programs, including X programs and Tcl/Tk programs.  It
 also provides an easy way for users to communicate with XPA-enabled programs
 by executing XPA client commands in the shell or by utilizing such commands
 in scripts.  Because XPA works both at the programming level and the shell
 level, it is a powerful tool for unifying any analysis environment: users and
 programmers have great flexibility in choosing the best level or levels at
 which to access XPA services, and client access can be extended or modified
 easily at any time. 

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