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The ATLAS High Level Trigger consists of two selection
steps, the Second Level Trigger and the Event
Filter. In this document the analysis and the conceptual design of the
High Level Trigger Selection Software are
presented. Its aim is to define an infrastructure that will be
used to implement the Second Level Trigger and the Event Filter. The
document is based on the PESA software
requirements document and on experience from previous prototype trigger
software implementations. The concepts outlined in the following guide
the detailed design and are therefore subject to
further refinement, which is to be documented in a future series
of detailed design documents.
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