Int 21 Fn 5F87  - LANtastic V3+ - Get Account                              [N]

   AX = 5F87h
   DS:SI -> 128-byte buffer for account information (see below)
   ES:DI -> ASCIZ machine name in form "\\machine"

Return: CF clear if successful
   CF set on error
       AX = error code
   BX destroyed

Note:  must be logged into the specified machine

Format of user account structure:
Offset Size    Description
 00h 16 BYTEs  blank-padded username (zero-padded for v4.x)
 10h 16 BYTEs  reserved (00h)
 20h 32 BYTEs  user description
 40h   BYTE    privilege bits (see below)
 41h   BYTE    maximum concurrent users
 42h 42 BYTEs  bit map for disallowed half hours, beginning on Sunday
       (bit set if half-hour not an allowed time)
 6Ch   WORD    internal (0002h)
 6Eh  2 WORDs  last login time
 72h  2 WORDs  account expiration date (MS-DOS-format year/month:day)
 76h  2 WORDs  password expiration date (0 = none)
 7Ah   BYTE    number of days to extend password after change (1-31)
       00h if no extension required
---v3.x---
 7Bh  5 BYTEs  reserved
---v4.x---
 7Bh   BYTE    storage for first letter of user name when deleted (first
       character is changed to 00h when deleting account)
 7Ch   BYTE    extended privileges
 7Dh  3 BYTEs  reserved

Bitfields for privilege bits:
 bit 7 bypass access control lists
 bit 6 bypass queue protection
 bit 5 treat as local process
 bit 4 bypass mail protection
 bit 3 allow audit entry creation
 bit 2 system manager
 bit 0 user cannot change password