Allow persistent connection from subscriber to sender for SUBSCRIBE requests

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What steps will reproduce the problem?
1. The Documentation states that Growl for Windows v2.0 does not yet 
support socket reuse. 

What is the expected output? What do you see instead?
I am particular interested in a Subscribe mechanism, using the specified 
subscribe message and subscribe from a client to the growl server which 
then notifies via this already existing socket. So the client is able to 
be notified by the growl service even if the client is behind a NAT router.

What version of the product are you using? On what operating system?
growl-for-windows 2.01
Please provide any additional information below.

Original issue reported on code.google.com by [email protected] on 21 Dec 2009 at 12:20