During client development, the registrar will have access to the .aero OT&E environment. In the OT&E environment, the registrar may test the operation of their software to verify the correct handling of EPP commands and their responses. Operations performed in the OT&E environment will not be charged and will not have any impact on the Production SRS. Registrars will continue to have access to the OT&E environment after certification so that they may continue to test their software systems.