Could I use Solr to index multiple applications?

[Zhang, Lisheng]

Hi,
 
We have an application where we index data into many different directories 
(each directory
is corresponding to a different lucene IndexSearcher).
 
Looking at Solr config it seems that Solr expects there is only one indexed 
data directory,
can we use Solr for our application?
 
Thanks very much for helps, Lisheng