Why is the gpg-agent PID part of GPG_AGENT_INFO?

[Hauke Laging]

Hello,

echo $GPG_AGENT_INFO 
/home/hl/.gnupg/S.gpg-agent:22684:1

why is the gpg-agent PID part of GPG_AGENT_INFO? I just made a test: I 
killed gpg-agent and started it again. The applications still connect to 
it though the PID is obviously wrong then.

The only effect I can see is that you can (relatively certainly) 
determine whether gpg-agent has been restarted. But is that of any use? 
Or what is the "official" reason?


Hauke
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