98f8282d_dministrator_And_The_Developer__Description
[Script] CheckPassword [Update] 22-FEB-2004 [Description] 
This function allows to check if a user/password combination is valid on a given server. This is usually not possible from within PL/SQL and Oracle does not offer any build-in mechanism or workaround to do so.
Material Dreams - Oracle Tools For The User, The Database Administrator And The Developer
Description