GPG without any local files?

[Gerben Wierda]

Is it possible to run gpg for verifying a signature, but without a 
homedir, options file, pubring.pgp, etc? Ideally I was thinking about 
having gpg get the key from a server (it's trust will of course be zero) 
and use that for verifying a detached sig. Currently I can do that by 
creating a temporary homedir in /tmp with an empty options file (and a 
pubring is created there), but I would prefer if gpg would do everything 
in memory.

G