Aug 21 (Reuters) - Canada's main stock index opened slightly lower on Thursday, dragged by technology shares, while investors turned cautious ahead of the U.S. Federal Reserve's three-day Jackson Hole symposium.
At 9:31 a.m. ET (1331 GMT), the Toronto Stock Exchange's S&P/TSX composite index .GSPTSE was down 0.06% at 27,863.02 points.