Multiple monitors, different setup

[Rob Kinsey]

Hi all,

Just getting into emacs right now and have got a set up I am happy with using 
the .emacs file.

At present I have a macbook pro and an external monitor. when the two are 
connected, to get emacs opening how I want to, i.e. open on non primary monitor 
and nearly maximized, I have used this line in the .emacs file:

(setq default-fram-alist
     '((top + -550) (left + -1400) (width . 190) (height . 60)))

which puts it nicely on my macbooks monitor which when docked is not the 
primary monitor.

Is there a way that I can have the .emacs file do a check to see if the second 
monitor is present so that when it is not docked, my emacs screen can be re 
positioned so it is in standard default out of the box emacs mode?

I am assuming an if statement in the lisp checking for dvi port but not sure 
how.

any help on this would be greatly appreciated.

Kind regards

P166BUG