client ID (=servent ID=servent GUID)
 

I have a question about the client ID ;

Then I took a look in the file downloads.txt (there Gnotella saves it's info about ongoing transfers), I noticed that Gnotella saves all client-Id's for each servent that has a specific file. If I'm d/l'ing Photoshop and Gnotella finds 50 different servers, Gnotella will save the IP & client-Id for all these servers until I finish the download.
My question is: What is the purpose for Gnotella to save the Client-Id's? Is it for resume? In that case, how? Or is it just for push-messenges?

Thanks in advance