The *Open Application Programming Interface* (OAPI) allows third-party products to integrate with [SAP2000|sap2000:home] such that users may create custom engineering applications. Additional information on the product and an optional subscription-based technical-support service may be found on the {new-tab-link:http://www.csiberkeley.com/support/csidn}CSIDN{new-tab-link} page of the {new-tab-link:http://www.csiberkeley.com/}CSI Website{new-tab-link}.