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<!DOCTYPE concept
  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
<concept id="GUID-687997B5-BDFD-49D1-947B-4AB21C3AF58C" xml:lang="en"><title>The
Running Model</title><shortdesc>This document describes the model by which a device driver handles
requests.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
<section id="GUID-697C8B0A-2468-4699-82FF-2E02E3F857A0">      
      <p>Once a logical channel and a physical channel, if appropriate, have
been created and initialised, the driver is ready to handle requests. </p> <p>On
the kernel-side, requests can be handled by one or more kernel-side threads,
allowing for rich and complex behaviour. Alternatively, if appropriate, a
request can be handled by code running in the context of the client user-side
thread, but running in supervisor mode. </p> <p>There are two kinds of request,
synchronous and asynchronous. </p>     </section>
</conbody></concept>