Int 2F Fn 4011  - Os/2 - Get Vdd Api Entry Point                           [O]

   AX = 4011h
   DS:(E)SI -> ASCIZ name of VDD registered with VDHRegisterAPI

Return: ES:DI -> breakpoint address to call for VDD API, or 0000h:0000h

Note:  this function may be invoked from either V86 or protected mode, and
     will return the appropriate address to call for invoking the VDD
     in that mode

See Also: AX=1684h"DEVICE API"