INT 2F - PC LAN Program - VERSION CHECK
        AX = B809h
Return: AH = minor version (decimal)
        AL = major version
Notes:  this function is also supported in this form by LAN Manager, the DOS
          LAN Requester, and 10NET v5.0
        10NET returns version 1.10 (AX=0A01h) for compatibility
SeeAlso: AX=4E53h,AX=B800h,AX=B809h"LANtastic"

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