Final answer:
The specific keyword to monitor and alert on both successful and failed logins depends on the system or software, with 'auth' for UNIX-like systems and audit policies in Windows. Security auditing tools must be configured to track login activities and monitoring solutions are set up to trigger the alerts.
Step-by-step explanation:
The keyword that can be used to alert on both successful and failed logins depends on the specific system or software being used. However, in general, system administrators can configure security auditing tools to monitor and alert on login activities. In the context of a UNIX-like system, for instance, both types of login attempts could potentially be tracked using the 'auth' facility in the syslog configuration, which records authentication related events. Similarly, in Windows, one might configure audit policies through the Local Security Policy to monitor successful and failed login attempts. To receive alerts, the administrator would likely set up a monitoring solution, which reviews security logs for the configured audit events and triggers notifications accordingly.