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easiest way to display a plot from C to kernel using Mathlink?

I am interested in using Mathlink to display plots, calling it

I am calling the Mathematica 4.0 kernel via C function calls in my own
program using Linux (Redhat 6.0)

I have searched the newsgroups for the last few years, and have not
found much information.
I have Gayley's Mathlink tutorial, but it falls apart in addressing the
display of postscript files or graphics when
calling the Mathematica kernel from external programs. (No examples).

I would like to know -
    * how to generate postscript files using C code w/ Mathlink /
Mathematica 4.0 Linux Redhat 6.0, gcc/g++
    * as well as ... how to automatically open a separate window to
display such graphics

I saw the mathlink/ frontEnd.C code posted, and although this code
compiled/ linked and produced a postscript
lfile,  ghostview choked on it. ( it uses obsolete function calls as

Could someone direct me to sources of code showing how to do this (
either on the web or recommend books that I might
purchase that would show how to write, essentially, C coded front ends),
or post some code or hints.

dave linenberg

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