sendings passwords with gpg-agent? (was Re: gnupg1 still needed?)

[Adam Milazzo]

Klaus Singvogel wrote:
> Please note either
> that SUSE Linux dropped the support for gpg1 since 10.3 (Oct 2007),
> and is shipping gpg2 only now.
Well, this makes me wonder, then.

gpg1 allows programs to send passwords using --command-fd. gpg2 always 
uses gpg-agent, and never asks for passwords on the --command-fd. Is 
there a way to get something equivalent on gpg2, though? i.e., can a 
program hook into the gpg-agent in such a way as to provide its own UI 
for password entry?