The Federal Reserve said on Thursday it was seeking feedback on how it operates its "discount window," which is intended to provide emergency lending to banks in times of stress. The Fed said it wanted comments on various aspects of how banks deal with the window, including the collection of legal documentation, pledging and withdrawing collateral, and extending credit. The solicitation marks the latest effort by the Fed to tweak the discount window, which banks have long resisted utilizing out of concern that it carries a stigma that could undermine stability in times of stress.