What is MDC?

[Nicky]

When I edit my key:

Command> showpref
pub  4096R/057AC4BC  created: 2005-12-08  expires: never       usage: CS
                      trust: ultimate      validity: ultimate
[ultimate] (1). Nicky <nixclusive0 at gmail.com>
      Cipher: TWOFISH, AES256, AES192, AES, BLOWFISH, CAST5, 3DES, IDEA
      Digest: SHA512, SHA384, SHA256, RIPEMD160, SHA1, MD5
      Compression: BZIP2, ZLIB, ZIP, Uncompressed
      Features: MDC, Keyserver no-modify
      Preferred keyserver: http://keyserver.pgp.com/
[ultimate] (2)  [jpeg image of size 28144]
      Cipher: TWOFISH, AES256, AES192, AES, BLOWFISH, CAST5, 3DES, IDEA
      Digest: SHA512, SHA384, SHA256, RIPEMD160, SHA1, MD5
      Compression: BZIP2, ZLIB, ZIP, Uncompressed
      Features: MDC, Keyserver no-modify

there is something called MDC in the features list. What is it and how do I 
benefit from it? I found some info here but didn't knew what to do with it:

http://www.google.com/search?q=define:MDC

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