HOWTO on interfacing with gnupg/pgp?

[Marc Mutz]

Hi out there!

Is there a howto somewhere that describes how one should go about 
interfacing (MUA's) with gnupg and pgp? Esp. secure passphase handling 
and calling conventions. I'm currently re-working KMail's interface to 
handle the passphrase more preciously, but I'm not sure how to hand it 
over to the external gnupg/pgp process.

Marc

-- 
Marc Mutz <Marc@Mutz.com>
http://marc.mutz.com/
http://www.mathematik.uni-bielefeld.de/~mmutz/
http://EncryptionHOWTO.sourceforge.net/