ViewPoint Manual

Functional Description
ViewPoint Manual—426801-001
5-20
Current and Historical Modes
and then resume updates by using the Thaw function key (SF8). You can specify a
delay time so that updates do not occur too rapidly for you to read comfortably.
When you request a particular page on the Primary or Alternate Events screen, the
content of the displayed page is relative to the current END page. As new events arrive,
the END page changes, and the set of events displayed for a particular page number
changes accordingly.
When you request the Network Status Summary screen or one of the other Events
screens from either the Alternate Events screen or Primary Events screen and then
return, your screen context is preserved. That is, you return to the page from which you
left, any selected event messages are still marked, and the frozen or thawed state is the
same. Screen context is not preserved when you move from page to page of the events
display; in that case, only the frozen or thawed state is preserved.
Current and Historical Modes
Figure 5-14 shows the basic mechanism for the current-events mode. The primary-
events cache is always used for current events, and there is only one primary-events
cache in an NCN (unless there is more than one ViewPoint application running).
The primary-events cache belongs to ViewPoint and is shared with other operators, if
any. The event collector and event log are part of Event Management Service (EMS).
In this basic scheme, subsystems report events in the form of event messages sent to the
event collector. The event collector records these event messages in an event log in the
Figure 5-14. Collecting and Displaying Current Event Messages
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