You can set connection properties in Open Client applications to request a security mechanism and the security mechanism’s services. Client-Library determines which security mechanism and services to use on the connection:
If the client application specifies a security mechanism, Client-Library checks in the [SECURITY] section of libtcl.cfg for a matching driver and loads that driver.
If the client application does not specify a security driver, Client-Library loads the security driver listed by the first entry in the [SECURITY] section of libtcl.cfg.
Client-Library determines which security services will be used for the connection from the client application.
If there is no libtcl.cfg or there are no entries in the [SECURITY] section, then there is no network security provider. In that case, the Open Server application authenticates the user if the user supplies the correct password.
