d3sign/Getty Images Barclays outlined the top questions investors are asking as the S&P 500 looks stuck in a tight trading range. "What will be the likely turning point to break the market higher or lower?" are among the inquiries. Stocks in the short term look more likely to move downward, it said. With large-cap US stocks essentially meandering and the Federal Reserve seemingly at a policy crossroads, what's next for the $40 trillion equity market? Barclays in a note Tuesday addressed five questions clients are asking at a time the S&P 500 continues to move rangebound as it has been…