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Each time the capture data changes, the following happens:

the plug-in's SetInitItem() is called multiple times to set some globals
the plug-in's SetCfgItem() is called multiple times to configure the plug-in with the user's settings for THIS signal
the plug-in's StartOfData() is called to allow final preparations
Data events from the pre-processor are streamed to the plug-in's Parse() routine. 
Parse() uses calls to various Data Output Routines to stream back field information.
When all of the events have been sent, the plug-in's EndOfData() is called.
If multiple signals are using the same plug-in, the above sequence will be repeated for each signal in turn (using that signal's specific configuration and the resulting event stream)