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  <a name="1204511"> </a><font color="#003366"  face="Verdana, Arial, Helvetica, sans-serif">17.7 	 Managing devices</font>
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  <a name="1204512"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">A new device is defined by the user by providing a device driver. This consists of a set of callback functions which carry out fundamental operations on the new device, for example, opening the device or writing to the device. The device driver is then registered with the I/O system, specifying a unique name for the device. It is this name which is specified in the filename when a file is opened on that device.</font>
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  <a name="1204513"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">The following sections describe how a device is registered and used from within an application program.</font>
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