PGP's handling of GPG's secret keys

[Marc A. Matteo]

All,

I've looked through the archives and looked through the FAQ but didn't
see this one (no it's not another "I can't import my GPG secret key into
PGP" post :)).

What I'm wondering about is what happens when you import ONLY a secret
key into PGP?  When I export a secret key by "gpg -a --export-secret-key
test > key.asc" and try to import in into another gpg application it -
expectedly - imports it only into the secret keyring.

However, importing that key into PGP actually imports a (seemingly)
fully functioning key pair, both public and private.  Really?  Is this
true?  How?

Following that, if the key's public key is then imported into PGP,
duplicate signatures appear.  I assume that this is because PGP handles
signatures differently?

But the REAL question is this.  If I export ONLY a secret key from GPG
and import it into PGP and then export the public key from that, what
have I just exported?  A secret key?  Does that make sence?

Thanks,
Marc

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