## Storage Device Driver Reference

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### Ring-3 Device Interface

The C++ DLL modules implement DDTT device-specific stub functions. Creating DDTT device interfaces requires knowledge of the C++ programming language and a detailed understanding of the device driver to be tested ( such as which functions the device is capable of performing). The DDTT provides many common functions, such as log file management and cover routines for the OS/2 APIs.

DDTT device stub function developers can use all of the functions described in Stub Utility Functions.