Compatibility: DPMI 0.9+
Expects: AX    0a00H
DS:SI (or DS:ESI) addr of an ASCIIZ  string which identifies the
DPMI host vendor
                                                                  
Returns: CF    NC (clear) if successful; else AX = DPMI Error Code
ES:DI (or ES:EDI) address of API extension API entry address
                                                                  
Info: If a specific DPMI host vendor supplies an extended API of DPMI
services, you may use this fn to obtain the address of the host
code that provides those services.

Use a FAR CALL to access the extended API.

Notes:   DPMI 1.0+ clients should use INT 2fH 168aH rather than this fn.

  The string passed via ES:(E)DI must match the vendor's name
exactly; the comparison is case-sensitive.

See Also: DPMI API
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INT 31H 0a00H: Get Vendor-Specific API Entry Address