rsync - Jan 2003 - rsync server with conf file

Hello -
 
I have normally been using rsync using only a single : in the command
line. What are the benefits of setting up an rsync server on the other
side using double colons :: ? Is it more efficient? 
 
Here is an example of what I use. The server 'iceland' is on the other
side of a WAN link. I'm not using an rsync.conf file.
 
rsync iceland://programs/ /journyx-backup/ --progress --stats --compress
--recursive --partial --archive -v
 
Thanks - Max
 
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