What are glibc2.X, libc5 and 6?

["David J. Kanter" <djkanter@nwu.edu>]

What's the purpose of these files? And is the older version of glibc
(version 2.0, right?) synonymous with libc5, and the newer version of glibc
(2.2?) synonymous with libc6?

I'm a little confused because I thought my system was pretty up-to-date, but
when I tried to remove libc5, dselect wanted to blow away Netscape, which is
a relatively new program.

-- 
David J. Kanter
djkanter@nwu.edu

"Humans have an innate tendency to attribute significance to anomalies
and coincidences."
  -- John Allen Paulos, mathematics professor at Temple University