BAGHDAD (AP) -- U.S. and Iranian envoys exchanged direct talks Saturday on efforts to end Iraq's violence and bolster its government, opening limited but potentially significant contacts that could ease their nearly 28-year diplomatic freeze. The discussions were confined to one session during a conference on Iraq stability, but they appeared to offer room for further interaction between the two nations _ which find themselves increasingly drawn toward common issues in Iraq as the nation's most influential allies. The U.S. ambassador to Iraq, Zalmay Khalilzad, said he exchanged views with Iranian delegates "directly and in the presence of others" at...