Signing documents with certificates

I'm trying to use digital certificates to sign documents. I can
retrieve/display/persist certificates, but I cannot determine if there
is a password associated with a certificate's private key, nor do I
know how to verify the password, if one exists.

Essentially, I am trying to do the same thing as signing a MS Word
document (Office XP or later.) I am using C#/Visual Studio 2005.

The Crypto API does not appear to be helpful. Does anyone know how to
do this?

.

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