Using two macports trees

[jiho]

Hi everyone,

I would like to keep two MacPorts trees separate on the same machine  
(the purpose is to have both gtk+x11 and gtk+quartz available at once,  
and with as little interaction as possible). I have my old macports  
in /opt/local/ and a installed a new one from source in /opt/local- 
exp/. I always define the PATH so that only *one* of those is included  
at a time.

However, using `port installed` always show the list of /opt/local-exp  
now, even when using /opt/local/bin/port

Is there somewhere where the log of the installed ports is kept  
outside of MP tree? how does the port command 'knows' where to look  
for ports? (and do you have experience doing this? some other methods  
to suggest?)

Thanks in advance.

JiHO
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http://jo.irisson.free.fr/