Question about using additional keyrings

[Faramir]

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Well, I followed the tutorial that shows how to use just subkeys
(without the main key), in order to keep the main key a bit safer than
usual. But that made me play a bit with the GPGShell options for GPG,
and managed to make it work, allowing to easily access my "whole" keys,
and to switch to subkeys after using them. The "magic" is done by adding
the following line to gpg.conf:

secret-keyring z:\gpghome\secring.gpg
(that's the location of the secring that has the unedited keys)

 But my question is: what does that line do? When it is in gpg.conf, do
I have the 2 secrings at the same time, or it replaces the usage of the
keyring located in gpghome with the one on my z drive?

 Best Regards
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