INT 6F - 10NET - "WHO" - ENUMERATE USERS ON NETWORK
        AH = 0Dh
        AL = type code
            01h return superstations only
            02h return non-superstations only
            otherwise return all
        CX = length of data buffer
        DS:DX -> array of records to be filled (see below)
Return: CL = number of records returned (responding stations)
SeeAlso: AH=16h,AH=8Dh

Format of station record:
Offset  Size    Description
 00h 12 BYTEs   node ID
 0Ch    BYTE    flags
                bit 1: workstation
                bit 2: superstation
                bit 3: xgate
                bit 4: active gate
---if AL = 01h---
 0Dh    BYTE    version number
 0Eh    WORD    level number of 10Net software in responding node
---if AL = 02h---
 0Dh  8 BYTEs   user ID
 15h    BYTE    version number
 16h    WORD    level number

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