dOPC Client Toolkit Help file
TdOPCEvent Properties Published Properties
Published Properties
Published Property 
Acknowledged is True if the corresponding condition has been acknowledged, otherwise False
AckRequired is True if this event requires acknowledgement, otherwise False
Active is True if the corresponding condition is active, otherwise False
ActiveTime contains the time at which the condition became active (for single-state conditions) or the time of a transition into the current sub-condition (for multi-state conditions). 
ActorID contains IDs for tracking events or condition-related events which are acknowledgment notifications. 
ChangeMask indicates what properties of the condition have changed and forced the server to send the event notification. 
ConditionName contains the name of the condition related to this event notification. 
Cookie contains the server-defined cookie associated with the event notification. 
Enabled is True if the corresponding condition is enabled, otherwise False
EventCategory contains either the standard or the vendor-specific event category. 
EventType indicates the type of the event; condition-related, tracking-related or simple. 
ID contains the unique Id of the event. 
This is Key, a member of class TdOPCEvent. 
Msg contains the message text which describes the event. 
NewState indicates a bit mask specifying the new state of the condition. 
NumEventAttrs provides the number of attributes of the event. 
Quality provides the latest quality read from the server. 
Severity contains a value indicating the event severity. 
Source contains a string indicating the source of the event notification. 
SubconditionName contains the name of the current sub-condition, for multi-state conditions. 
Time provides the time of the event occurrence. 
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