clarification on automated signing

[danl001]

Hi,

I need to do some automated signing in a script so I read the "How can I 
use GnuPG in an automated environment?" section of the FAQ at

http://www.gnupg.org/(en)/documentation/faqs.html#q4.14

I have a few questions. So I start by creating a keypair the usual way 
using --gen-key and then add an additional signing subkey. Then I export 
  the secret keys using --export-secret-keys > secring.auto

The FAQ answer then says to copy secring.auto and pubring.gpg to a test 
directory. Do I need to rename secring.auto to secring.gpg? If i don't, 
gpg just creates a 0 length secring.gpg file anyway. I can remove the 
passphrase with passwd, but which keys should I actually delete? I only 
want to have the subkey installed on the target machine, right? How do I 
do this?

It then says to copy secring.auto to the target machine and "install" it 
as the secret key ring. What exactly does install mean here? Do I need 
to rename it to secring.gpg? Also, do I need to copy over pubring.gpg 
with it?

If someone could clarify the process of setting things up for automated 
signing, I'd appreciate it. Thanks.