[pluggo] Pluggo and pattrstorage

Hi,

I am in programming a Pluggo and I want to store different settings  
(- not in the plugconfig) when working in the host Ableton Live. I  
read in the forum that the best way to go is the route of pattr.
I have some questions:
- How can I automatically read and write the xml-files from disk  
(with a relative path ?), so a user do not have to care about ?
- If I want to open the Pluggo more then once, is there a local write/ 
read for each xml-file (like "s --whatever") ?
- to recall the pattr-presets I want to do a pp for every preset, so  
I can load it with a MIDINote within Live, is this the right approach ?

regards
reinhold