3.2 Access to PCs, servers, and databases with payment applications must require a unique username and secure authentication.
PCI Data Security Standard Requirements 8.1 and 8.2
Testing Procedures:
3.2 Examine PA-DSS Implementation Guide created by vendor to verify customers and resellers/integrators are strongly advised to control access, via unique username and PCI DSS-compliant secure authentication, to any PCs, servers, and databases with payment applications and cardholder data.