Sending a region to another X application

[dieter@duenenhof-wilhelm.de (H. Dieter Wilhelm)]

Hello (),

I've written a major mode (https://code.google.com/p/ansys-mode/) for an
obscure programming language (APDL
http://www.ansys.com/Support/Training+Center/Courses/Introduction+to+ANSYS+Mechanical+APDL)
which is used to automate finite element simulations.

At the moment the user is "copy and pasting" code snippets from an Emacs
buffer to the TCL/TK application's "command" text field.  The Emacs mode
would be more helpful if one could directly "send" code fragments with a
key binding to the application.

I've no experience with GUI programming and the only idea I've got from
internet investigations, so far, is to utilise an external C program for
sending the data over the X server with the help of libraries like Xlib
or XCB, but there seems to be little documentation.  Do you have a
better idea or is this the easiest way to go?

       Dieter
-- 
Best wishes
H. Dieter Wilhelm
Darmstadt, Germany