<p> A single-headed arrow points from OCA to the database, indicating their connection at OCA's initiative. Double-headed arrows connecting SSO with OID, database, and with OCA show the two-way communication betwen those elements.
The diagram shows web clients connected by double-headed arrows to either
the SSO instance or to Oracle Wallet Manager. Separately, thick clients
connect directly to the Oracle Wallet Manager, which then connects to Oracle9iAS.