Sample Configuration: Two boxes, one runs server ("kenny"), second agent ("alk").
Goal: Send E-Mail alert if CPU Load is too high on box "alk".
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run NxCon and login:
Main Window:
Press F3 to open Object Browser window:
Right-click on Node name in Object Browser window, then select Data Collection item from the menu:
Right-click anywhere in the Data Collection Configuration window, select New menu item. DCI configuration dialog will appear. Select Collection tab, then press Select button and look for System.CPU.Usage:
Press OK to close parameter selection dialog, select Thresholds tab, then press button Add:

In this example: "If Last Value is greater or equal 50% generate SYS_THRESHOLD_REACHED event"
Close both dialogs, Threshold Configuration and New Data Collection Item by pressing OK twice. Press F9 to open Control Pannel window:
doubleclick on Actions icon:

Right-click in Action Configuration window, then select New item from the menu:

NB! Don't forget to set "SMTPServer" and "SMTPFrom" in table "config" and restart server before it will be able to send e-mail notifications. Go back to Control Panel and open Event Processing Policy window by doubleclicking on Event Processing Policy icon:

Right-click on the last rule, select Insert Rule menu item, then select Bottom option. New rule will be added to the end of the list. Right-click on the Event column (on new rule line), then select Add menu item and in Select Event dialog window search for SYS_TRASHOLD_REACHED item:

Right-click on the Action column, then select Add menu item. In the Select Action dialog window select previously created action ("test"):

Resulting Policy should look as shown below:

Close Policy Editor window. Confirmation message will appear and after positive response new policy will be installed on server.
Now run any CPU-consuming task (we need 50+% load) and wait one minute, then check mailbox.