CMS is one of about twenty Physics groups here in Princeton University. 
We have our own Linux distribution based on RHEL with a few Princeton 
specific home grown RPMs. The CMS group has been using SL. We are trying 
to find a most practical way of providing a "SL" environment on top of 
RHEL based Linux without having to change the base distribution for the 
other 19 groups in the department. I guess Princeton is not the only 
University that has and want to maintain their own Linux distribution.

Since both PU and SL are based on RHEL, I believe, there is lot more 
similarity than differences in the two distributions. Can we simply 
setup workstations of CMS group using PU linux and then install a few SL 
RPMs to convert them to SL? Will it work for CMS work or there are some 
fundamental changes which make SL very different, and probably 
incompatible with RHEL?

Thanks,

Vinod Gupta
Physics department
Princeton University