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diff --git a/xpa/README b/xpa/README new file mode 100644 index 0000000..08a4bcb --- /dev/null +++ b/xpa/README @@ -0,0 +1,43 @@ +This is the directory for XPA 2.0. + +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. + +A program becomes an XPA-enabled server by defining named points of +public access through which data and commands can be exchanged with +other client programs (and users). Using standard TCP sockets as a +transport mechanism, XPA supports both single-point and broadcast +messaging to and from these servers. It supports direct communication +between clients and servers, or indirect communication via an +intermediate message bus emulation program. Host-based access control +is implemented, as is as the ability to communicate with XPA servers +across a network. + +XPA implements a layered interface that is designed to be useful both +to software developers and to users. The interface consists of a +library of XPA client and server routines for use in C/C++ programs and +a suite of high-level user programs built on top of these libraries. +Using the XPA library, access points can be added to Tcl/Tk programs, +Xt programs, or to Unix programs that use the XPA event loop or any +event loop based on select(). Client access subroutines can be added +to any Tcl/Tk, Xt, or Unix program. Client access also is supported at +the command line via a suite of high-level programs. + +To build XPA, see the INSTALL instructions (which are based on +standard instructions for building software using GNU configure). + +Documentation for XPA is contained in the doc subdirectory (where the +help.html file is the top-level index). + +If you have questions, please contact us at: saord@cfa.harvard.edu. + + Eric Mandel + +XPA is distributed under the terms of The MIT License. |