## MMPM/2 Device Driver Reference

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### Interface to the VSD

The interface to the Vendor Specific Driver (VSD) uses an entry point called VSDEntry. First a DosLoadModule is issued for the VSD's DLL. The DosLoadModule returns a handle for the VSD. Then with the VSD handle, a DosQueryProcAddr is issued to find the VSD entry point (VSDEntry). From this point on, calls to the VSD are made through the following API:

    ULONG    VSDEntry ( HVSD       hvsd,     // Handle to VSD driver
                        ULONG      ulFunc,   // Function code
                        ULONG      ulFlags,  // Flags for driver
                        PVOID      pRequest) // Request Parameter Block/Value