Suresh B. (8/20/2012)
Yes. It is still valid.
It's caled uniquifier.
Using the term uniquifier, on line I found:
In books online I could not find the term uniquifier, neither could I find a description of the phenomem. But that could be my problem with the books on line. (I did use the old BOL a lot, but with the 'new' BOL, I tend to find the information faster on the web).