gpg-agent directories in /tmp

[Chris]

I've got a bunch of directories in /tmp that are like this:

gpg-ZEMbnK:
total 0
srwxrwxr-x  1 chris chris 0 Aug 16 20:42 S.gpg-agent=
gpg-uo6rHn:
total 0
srwxrwxr-x  1 chris chris 0 Nov 23  2005 S.gpg-agent=
gpg-ukogMJ:
total 0
srwxrwxr-x  1 chris chris 0 Jul  8 22:45 S.gpg-agent=
gpg-t1Jcgi:
total 0
srwxrwxr-x  1 chris chris 0 May 14  2006 S.gpg-agent=
gpg-pI9dfK:
total 0
srwxr-xr-x  1 chris chris 0 Dec 29 18:28 S.gpg-agent=
gpg-Ojg1JY:
total 0

and so on, about 25 all together. What is their purpose and can they be safely 
removed? What is the purpose of the S.gpg-agent socket file that is 0 bytes?

Thanks
Chris

-- 
Chris
http://learn.to/quote
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