>From: pocmatos@gmail.com

>I have some code which I would like to make dependent on the machine I
>am currently working on. I have a single .emacs shared between my work
>machine and my home machine. I thought about making dependent on the ip
>address (or hostname) but then I need a way to get the ip address (or
>hostname) of my current machine.
>
>Any suggestions on the best way to do this?
>
>(I don't think it matters but the code I need to change is mostly the
>loading of certain libraries and the setting of the smtp server for
>gnus)


I can offer one possible solution.  

I use the same ~/.emacs on several machines, but there are slight
differences in the way that each machine is configured.  To give a
concrete example, I'd like to use "ant -find build.xml" as the default
compile command at work, and "make" as the default compile command at
home.

To achieve this, my ~/.emacs has

   (if (file-exists-p "~/.elisp/machine-local.el")
       (load "~/.elisp/machine-local.el"))  

machine-local.el has the machine-specific settings.

The Emacs manual has a similar example, which uses custom-file.

   http://www.gnu.org/software/emacs/manual/html_node/emacs/Saving-Customizations.html#Saving-Customizations

Steve