Accessing cluster objects

hello
I've been doing some experiments with CLUTO. It serves my needs pretty well, but I also need to be able to known which object is in which cluster
This can be done by the -plotmatrix parameter, but the resulting image is not very clear when the number of objects and features is large.

Is there a way to know the contents of each of the cluster? I am thinking that the -rlabel parameter might be useful, but it works only when plotting the clustering in an image, whereas for my case, a list of clusters and their contents will be more useful.

e.g.
Cluster 1:
- row 1
-row X
-....

regards
ashwin