Event processing was initially designed to scan records in tight coordination with an event detected in the hardware - such as a gated ADC. The post_event call is typically implemented in an interrupt service routine to minimize latency in the case of a required response. Forward links would cause a chain of records to respond to the event.
This was extended to support soft events and then supported through some record support.
As Ralph pointed out, using the CPP attribute on an INLINK is a better way to cause records to process when the field of some other record is processed.
The Record Reference Manual and the Application Developer's Guide both go into this issue. The App Developer's Guide shows how to implement this in the drivers (as I recall).
Bob
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