"Using E-Verify is an important step in ensuring that your company has a legal workforce by electronically confirming the information on Form I-9, Employment Eligibility Verification. We are here to support you and provide you and your company with the tools and understanding to get the most out of the benefits of E-Verify. This guide is designed to assist you through the E-Verify enrollment"
U.S. Citizenship and Immigration Services: http://www.uscis.gov/