Microsoft KB Archive/101502

= Device Driver Start Codes =

Article ID: 101502

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Advanced Server 3.1
 * Microsoft Windows NT Workstation 3.1
 * Microsoft Windows NT Advanced Server 3.1

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This article was previously published under Q101502



SUMMARY
Windows NT device drivers define the following start codes:


 * Boot
 * System
 * Auto
 * Demand
 * Disabled

The text below provides additional details about each of these start codes.

Boot
The Boot start code indicates that the OS loader loads the driver at boot time before the executive system receives control. The disk driver for the system disk is an example of a Boot driver. If the system cannot load a Boot driver it cannot load the other drivers.

System
The System start code indicates that the I/O system loads the driver during initialization. The mouse driver is an example of a System driver.

Auto
The Auto start code indicates that the Service Controller loads the driver during its initialization. The parallel part driver is an example of an Auto driver.

Demand
The Demand start code indicates that the Service Controller loads the driver only when it is explicitly instructed to do so. By default, Windows NT does not use any Demand drivers. You might create a Demand driver by loading the parallel port driver only when you want to print a document or only when a specified printer is available.

Disabled
The Disabled start code indicates that the system does not load the driver. Windows NT sets the Disabled start code for all drivers in the system that it does not load (because corresponding hardware is not installed or for any other reason).

Additional query words: prodnt

Keywords: kbother KB101502

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