Ediff from command line - winXP

[Søren "Pengman" Pedersen]

Hey all...

Im trying to invoke emacs to do a comparesion of two files under windows XP
with
emacs -f (ediff-files "file1" "file2")
from a command line, but O get the following errors in the *messages* buffer
within emacs

command-line-1: Symbol's function definition is void: \(ediff-files
Server subprocess exited

2 questions:

1. How do I make it work??

2. How would I send this command to a running emacs via gnuclientw??

thanks in advance
søren