summary of what the purpose of the Public Company Accounting Oversight Board (PCAOB) is , why PCAOB was created, if public accounting firms must register with the PCAOB before performing audits of public companies, which organization has oversight and enforcement authority over the PCAOB. Also, does Sarbanes Oxley require Integrated audits of companies and what non-audit services can or cannot be performed by auditors of public companies.