When a monitor fails, or restores its state from fail to success, the "Default Actions" are executed. If you click File -> Default Actions, you see a form similar to the one shown below in Figure 1:
Figure 1: Default Actions
Right now, the default actions list is empty. You can add an action by clicking on the Add button. Once you click on Add button, the following screen opens up:
Figure 2: Add Action
Which type of Action would you like to add?
There are four types of actions that you can add, these are shown in the figure below:
Figure 3: Types of Actions
WinPopup Action
This action sends a popup message to a configured target using Windows messenger service.
PlaySound Action
This action plays a sound if certain event or state occurs.
SendEmail Action
This action sends an email if certain event or state occurs.
StartProgram Action
This action executes a program or exe file if certain event or state occurs.
Initial Name of the Action
It is to specify the name of the action.
Default Actions list
Figure 4: Default Actions list
Once you have some actions in the list, you can Edit, Delete and also change their display order with up and down arrows.