The Systems Files pane provides for specifying particular System files against which the alert is to run. By default, when you insert an alert in the Alert file, All System Files is selected in the Alerts pane so that the alert is processed for all System files. However, if you clear this checkbox for an alert, the options in this pane become available so that you can specify the particular System files against which the alert is to run. For more information, see Specifying the System Files Against Which the Alert is to Run.