Frequently used in technical IRC and Usenet discussions, the acronym resolves ambiguity in complicated and/or lengthy discussions.
When it is not immediately apparent to which conversation or to whom a comment is directed, "wrt" is used.
JohnQ Public: "I am looking to buy a new HDTV and I would like to know the best display technology."
SoAndSo: "JohnQ Public, That is a difficult question to answer; budget wise, however, CRT and LCD HDTVs are a clear winner."
RandomPeople: "... <unrelated conversation> ..."
SoAndSo: "CRT or DLP wrt HDTV contrast ratio."