ExtClassEvent Event
The ExtClassEvent event is triggered by external objects such as Active X controls.
on extclassevent [fieldname] ['eventname'] [([parameterlist])]
fieldname
Is optional if you specify the event block in a field script
eventname
Is a string specifying the external event name, surrounded by quotes
parameterlist
Defines named parameters passed in from the external object raising the event:
variablename = type{,variablename = type}
variablename
Specifies a named parameter defined by the event
The event block script can then use these parameters as local variables.