quantitative easing

Over the last six years the Federal Reserve has been using a economic stimulus methodolgy called "Quantitative Easing."  The goal of the various QE's have been to flood financial institutions with money so they in would lend capital.   The thought behind this would be to promote growth and emoloyment.  Can you please discuss how QE between the Fed and the Banks?  Also, please research how the Fed actually creates the moneu to supply to the financial institutions?  What is the risk to QE to the Economy?  In your opnion has it been successful at all?