A requestor LU can invoke this function on behalf of a user to ensure that the user's password has not expired before sending an attach request to a server LU. If the SIGNON/Change password TP indicates that the password is expired, the LU can prompt the user for a new password and invoke the SIGNON/Change password TP again to change the user's MVS password.

After the SIGNON/Change password TP confirms that the user is signed on with an unexpired password, and the requestor LU receives a generalized data stream (GDS) variable indicating that the user is signed on, the LU can add the user to the signed-on-to list and send the user's original attach request. For more information on the SIGNON/Change password GDS variable, see Description of SIGNON/Change Password GDS Variable.

This process may be implemented with an application TP, or it may be used in an implementation of PV for an LU. With PV, SIGNON/Change password should be invoked only once for all of a user's conversations in a session. The sending LU may check its own signed-on-to list and invoke the SIGNON/Change password TP if the user is not in the list.