I'd like to speak to you, WRT the document you sent me.

phone: why don’t you go to sleep tommy it’s 2 in the morning?
tommy:why don’t you die you dumbazz

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."

I think the Middle East remains the center of attention w.r.t. wars & rumors of war.