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<!DOCTYPE concept

  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">

<concept id="GUID-C98DF912-A903-4FDB-B27A-CC8E75E3E40F" xml:lang="en"><title>The

Logical Channel</title><shortdesc>This document describes how device driver code is accessed through

a logical channel.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>

<section id="GUID-62823FF9-984A-4A28-9E8E-98C7033C34B9">    

     <p>All interaction between user code and the driver code takes place

through a logical channel. On the user side, a channel is encapsulated by

a <codeph>RBusLogicalChannel</codeph> derived class; on the Kernel side, a

channel is encapsulated by a <codeph>DLogicalChannelBase</codeph> or a <codeph>DLogicalChannel</codeph> derived

class, constructed by the <codeph>DLogicalDevice</codeph> factory object. </p> <fig id="GUID-E27A3A17-366D-5551-A26E-FC8E0853D72A">

<title>                 Device driver logical channel classes            

  </title>

<image href="GUID-F4E04E00-D9C6-5E8F-9EC6-F90BC951D4D0_d0e291444_href.png" placement="inline"/>

</fig>     </section>